CS107: C++ Programming Certification Exam Answers

Table of Contents

CS107: C++ Programming Exam Quiz Answers

Question 1: The first program ever written was written for which device? Select one:

Analytical engine
ENIAC
Altair
Von Neumann Architecture

Question 2: To create a program in Eclipse, which of the following must you first create? Select one:

C++ class
C++ project
C++ package
C++ program file

Question 3: This code produces an error message. Where will the error occur, and why?

1 bool a = 1;

2 int b = 2 + 4;

3 float c = 4;

4 counts<<a + b<<endl;

Select one:

Line 1: a is a boolean variable, so it cannot accept an integer
Line 2: Any calculations must be on the left side of the assignment statement
Line 3: Since c is a float, we must assign it the value 4.0
Line 4: You must complete the calculations before you can request to output

Question 4: What is the first output on the screen after the following code is compiled and its executable run?

1 #include <iostream>

2 #include <string>

3 #include <sstream>

4 using namespace std;

5 int main () {

6 string str;

7 float price = 0;

8 int quantity = 0;

9 counts << “Enter price: “;

10 getline (cin, str);

11 stringstream (str) >> price;

12 counts << “Enter quantity: “;

13 getline (cin, str);

14 stringstream (str) >> quantity;

15 counts << price * quantity << endl;

16 return 0;

17}

Select one:

Enter:
Enter price:
Enter quantity:
Enter >>price

Question 5: Which of the following will allow the user to read input to collect the value of the variable age? Select one:

cin<<age;
cin>>age;
count<<age;
count>>age;

Question 6: Assume that you have two variables, a1 = 5 and a2 = 2, both declared as an int. What is the result of a3 with this calculation?

double a3 = double (a1 % a2)

Select one:

1.0
1.5
2.0
2.5

Question 7: Which of the following statements about variable names is true? Select one:

A valid variable name can be up to 40 characters in length.
A valid variable name can start with a number and end with a number.
A valid variable name may consist of letters, digits, and the underscore (_) character.
A valid variable name may contain uppercase letters, which are no different than lowercase letters.

Question 8: Assume that you have two variables, a1 = 5 and a2 = 2, both declared as an int. What is the result of a3 with this calculation?

int a3 = a1/ a2

Select one:

Question 9: Given the values a = 5, b = 6, c = 2, and d = 3, what is the value of result for this formula?

int result = a % c + b + d * a

Select one:

Question 10: Which order will the operations in this formula be calculated in? Use the number beneath each operation sign for reference.

double result = 3 + 5 % 2 – 1 * (3 + (8 – 2) / 3)

1 2 3 4 5 6 7

Select one:

1, 2, 3, 4, 5, 6, 7
2, 4, 7, 1, 3, 5, 6
6, 7, 5, 1, 2, 3, 4
6, 7, 5, 2, 4, 1, 3

Question 11: What is the output after the following code is compiled and its executable run?

#include <iostream>

using namespace std;

int main () {

int a, b, c;

a = 5;

b = 6;

c = (a>b)? a: b;

count << c << “\n”;

return 0;

}

Select one:

Question 12: What type of conditional is executed in this code?

if (x > 0)

{

count << “x is positive” << endl;

} else if (x < 0)

{

count << “x is negative” << endl;

} else

{

count << “x is zero” << endl;

}

Select one:

Alternative execution
Chained conditional
Nested conditional
Unary conditional

Question 13: While debugging in Eclipse, which key do you use to step over the call? Select one:

Question 14: C++ provides standard mechanisms to check if the allocation was successful. Which of the following is one way to do this? Select one:

Use the nothrow method
Use the noallocate method
Check the data before it is entered
Use a bad_allocation_fail exception

Question 15: What is the output after this code is compiled and its executable run?

#include <iostream>

using namespace std;

void pn (int x, int& p, int& n) {

p = x-1;

n = x+1;

}

int main () {

int x = 10, y, z;

pn (x, y, z);

count << y << “, “ << z << “\n”;

return 0;

}

Select one:

9, 10
9, 11
10, 11
11, 9

Question 16: Which of the following is required to pass an argument by reference? Select one:

swap (2,3); Pass the values as literals
swap (&x, &y); Send the address of the variable as an argument
&a, &b = swap (x, y); It must be returned to a variable as an address
void swap (int &x, int &y); Receive the variables in the parameter as an address

Question 17: Suppose I had a phone number stored in a string variable named phone. The value in the phone variable is 289–638–4278. What series of statements would change the area code to be expressed in parentheses, as (289)638–4278? Select one:

phone = “(” + phone. replace (phone. find (‘0’),1,”) “;
phone. replace (phone. find (‘-‘), “)”);
phone. insert (0,”(“);

phone. replace (phone. find (‘-‘),1,”) “);

phone. replace (0,”(“);

phone. replace (phone. find (‘-‘),1,”) “);

Question 18: Which array has more elements, int i[ 3 ][ 5 ] or int j[ 15 ]? Select one:

i and j are equal
i is currently larger than j
j is currently larger than i
The size of j is dynamic and will expand as needed so j will be larger than i

Question 19: Which of the following situations would be the best time to use destructors? Select one:

When the object has created an error
When we want to create a new object
When we want to release the memory that the object possesses
When we want to capture the memory that the object possesses

Question 20: When is a constructor function called? Select one:

Explicitly, whenever a new object of the constructor class is created
Automatically, whenever a new object of the constructor is destroyed
Automatically, whenever a new object of the constructor class is created
If it is defined in the class and called when a new object of this class is created

Question 21: Which of the following is an example of function overloading? Select one:

void setInfo (string a) {} void (string b) {}
void setInfo (int a) {} string setInfo (int a) {}
void setInfo (int a, int b) {} void setInfo (int b, int a) {}
void setInfo (int a, int b) {} void setInfo (int a, string b){}

Question 22: What does the keyword this represent? Select one:

A reference to a memory location of a variable
A pointer to the function that is being executed
An object whose member function is being executed
A pointer to the object whose member function is being executed

Question 23: What are the static data members of a class? Select one:

Members with one unique value for all the objects of that same class
Members with one unique value for all the objects of multiple classes
Members with multiple unique values for all the objects of that same class
Members with multiple unique values for all the objects of multiple classes

Question 24: Given two classes, Person and Student, how do we define within the Student class that Student is a friend of Person? Select one:

friend class Person ();
friend Person;
class friend Person;
friend class Person;

Question 25: Which of the following is this image an example of?

Select one:

Hierarchical inheritance
Hybrid inheritance
Multilevel inheritance
Multiple inheritance

Question 26: What error is included in this code?

#include <iostream>

#include <math>

using namespace std;

int main ()

{

countdown (3);

return 0;

}

void printLogarithm (double x)

{

if (x <= 0.0) {

count << “Positive numbers only, please.” << endl;

return;

}

double result = log (x);

count << “The log of x is “ << result;

}

void countdown (int n) {

if (n == 0) {

count << “Blastoff!” << endl;

} else {

count << n << endl;

countdown (n-1);

}

Select one:

The functions appear after the main
Main does not call the correct function
The functions should have a return value
The printLogarithm function should contain an else clause

Question 27: Which of the following best describes polymorphism? Select one:

It uses a derived class in a similar manner as the base class, with the use of pointers
It takes advantage of the fact that a pointer to a derived class is type-compatible with a pointer to its base class
It takes advantage of the fact that a class has only a single function with the same data type pointing to the derived class
It makes sure that all pointers in the derived class point to functions within the base class, but not to the operator members

Question 28: What is the output after this code is compiled and its executable run?

#include <iostream>

using namespace std;

class polygon {

protected:

int width, height;

public:

void setValues (int a, int b) {width=a; height=b;}

};

class output {

public:

void output (int i);

};

void output: output (int i) {

count << i;

}

class rectangle: public polygon, public output {

public:

int area () {return (width * height);}

};

class triangle: public polygon, public output {

public:

int area () {return (width * height / 2);}

};

int main () {

rectangle rct;

triangle trgl;

rct. setValues (4,5);

trgl. setValues (4,5);

rct. output (rct. area ());

count << ” “;

trgl. output (trgl. area ());

count << “\n”;

return 0;

}

Select one:

4 5
5 4
10 20
20 10

Question 29: How do we define a mutator named setName? Select one:

string setName () {return name;}
void setName () {name = myname;}
string setName(myname) {name = myname;}
void setName (string myname) {name = myname;}

Question 30: Which of the following is the correct use of a template? Select one:

template<typename T>

class Foo {

public:

Foo ();

void someMethod (typename T x);

private:

typename T x;

};

class Foo {

public:

Foo ();

void someMethod (T x);

private:

T x;

};

template<typename T>

class Foo {

public:

Foo ();

void someMethod (T x);

private:

T x;

};

<typename T>template

class Foo {

public:

Foo ();

void someMethod (T x);

private:

T x;

};

Question 31: What import statement is used to read and write from/to files? Select one:

#include <iostream>
#include <ofstream>
#include <ifstream>
#include <fstream>

Question 32: Given the code below, you want the method to issue an error if b is equal to zero, so that you are not dividing by zero. Write the code in line 3 that issues this error.

1 double division (int a, int b) {

2 if (b == 0) {

3 <Enter code here>

5 returns (a/b);

Select one:

throws “Division by zero condition!”;
throw “Division by zero condition!”;
exception “Division by zero condition!”;
catch “Division by zero condition!”;

Question 33: Who developed the C++ programming language? Select one:

Brian Kernighan
Bjarne Stroustrup
Dennis Ritchie
Ken Thompson

Question 34: Why would the output of 13/5 be 2 and not 2.6? Select one:

When we divide, the result is always a float.
When we divide, the result is always an integer.
When we divide two integers, the result will always be an integer.
When we divide two numbers, the result will be a float, which then gets converted to an integer.

Question 35: Which of the following will allow the user to read input to collect the value of the variable age? Select one:

cin<<age;
cin>>age;
cout<<age;
cout>>age;

Question 36: Which of the following statements about variable names is true? Select one:

A valid variable name can be up to 40 characters in length.
A valid variable name can start with a number and end with a number.
A valid variable name may consist of letters, digits, and the underscore (_) character.
A valid variable name may contain uppercase letters, which are no different than lowercase letters.

Question 37: If b = 3 and then a = b++, what do a and b contain? Select one:

a contains 3, b contains 3
a contains 3, b contains 4
a contains 4, b contains 3
a contains 4, b contains 4

Question 38: When a value is passed to a function, what is the term for the value that is passed? Select one:

Argument
Call
Instance
Parameter

Question 39: Which of the following statements would produce a True result given this code?

char s1[] = “alpha”;

char s2[] = “alpha”;

char s3[] = “beta”;

char s4[] = “gamma”;

Select one:

strcmp (s1, s2);
strcmp (s1, s3);
strcmp (s3, s4);
strcmp (s1, “Alpha”);

Question 40: What is the output after this code is compiled and its executable run?

#include <iostream>

#include <string>

using namespace std;

main () {

string B (“money”);

string S (“goods”);

count << “before, B has “ << B;

count << ” and S has “ << S << “; “;

swap (B, S);

count << ” after, B has “ << B;

count << ” and S has “ << S << endl;

return 0;

}

Select one:

B has goods and S has money
B has money and S has goods; B has goods and S has money
after, B has goods and S has money; before, B has money and S has goods
before, B has money and S has goods; after, B has goods and S has money

Question 41: What is a default constructor in a class definition? Select one:

Constructor with no functions
Constructor with no arguments
Constructor with one argument
Constructor with name argument

Question 42: When do you use this keyword in a constructor? Select one:

When there are no parameters
When the parameters are undefined
When there are no data members defined
When the data members have the same name as the parameters passed in

Question 43: In order to use two classes with the same name in C++, you must do which of the following? Select one:

Use dot notation
Put it in a separate folder
Create a different namespace
Create a different folder and use dot notation

Question 44: What does a derived class inherit from the base class? Select one:

It inherits every member of a base class
It only inherits the operator members, not the methods, including constructors and destructors
It inherits every member of a base class including the operator members but does not include the constructor and destructor
It inherits every member of a base class but it does not inherit its constructor and destructor, operator members, or its friends

Question 45: Which of the following is a characteristic of an accessor? Select one:

It requires one argument
It may accept multiple parameters
The name of the accessor begins with the Set prefix
It has a return type consistent with the data being retrieved

Question 46: Which of the following was the first high-level language developed? Select one:

C
COBOL
Fortran
Java

Question 47: Which object in C++ has access to the standard input of a program (text on the screen)? Select one:

cin<<
cin>>
cout<<
cout>>

Question 48: Which object in C++ has access to the standard output of a program (the screen)? Select one:

cin<<
cin>>
cout<<
cout>>

Question 49: Which data type in the C++ language was not included in the C language? Select one:

boolean
char
double
float

Question 50: What is the value of a in a = 5 + 7 % 2 *3? Select one:

Question 51: What is the result of this statement, following the correct order of operations?

result = 4 * 2 + 1 * 3 – (2 * 3 + (4 / 2) + 3)

Select one:

Question 52: What does the statement a = (b = 5, b+1) do? Select one:

It assigns the value 5 to a and then assigns b+1 to variable a
It assigns the value 5 to b and then assigns b+1 to variable b
It assigns the value 5 to a and then assigns b+1 to variable b
It assigns the value 5 to b and then assigns b+1 to variable a

Question 53: What is the final output of the following code?

int a = 5;

int b = 10;

int c = 3;

for (int x =0; x< 5; x++)

{

a += 2;

b -= 1;

c *= 2;

}

count<<“A is “<<a<<” and C is “<<c<<endl;

Select one:

A is 10 and C is 30
A is 10 and C is 96
A is 15 and C is 30
A is 15 and C is 96

Question 54: What is a reference to a variable in C++? Select one:

The size of a variable in computer memory
The type of a variable in computer memory
The address that locates a variable in computer memory
The address that locates the start of a program in computer memory

Question 55: What is the output after this code is compiled and its executable run?

#include <iostream>

#include <string>

using namespace std;

int main () {

string str (“Let us do something crazy”);

cout << “size: ” << str.size() << “, “;

cout << “length: ” << str.length() << “, “;

cout << “capacity: ” << str.capacity() << “, “;

cout << “max size: ” << str.max_size() << “\n”;

return 0;

}

Select one:

size: 2, length: 2, capacity: 2, max size: 25
size: 5, length: 5, capacity: 5, max size: 4611686018427387897
size: 25, length: 5, capacity: 25, max size: 25
size: 25, length: 25, capacity: 25, max size: 4611686018427387897

Question 56: What will be the output of this program?

1 #include <iostream>

2 using namespace std;

3 int array1[] = {1000, 100, 2100, 1200, 1500};

4 int array2[] = {10, 12, 14, 16, 18};

5 int temp, result = 0;

6 int main ()

7 {

8 for (temp = 0; temp < 5; temp++)

9 {

10 results += array1[temp];

11}

12 for (temp = 0; temp < 4; temp++)

13 {

14 results += array2[temp];

15}

16 counts << result;

17 return 0;

18}

Select one:

70
5900
5952
5970

Question 57: Which of the following is the correct definition of a destructor for the class Person? Select one:

~Person ();
delete Person ();
destroy Person ();
~Person (int x, int y);

Question 58: Which line from this code indicates that class Car inherits from class Vehicle?

1 class Vehicle {

2 protected:

3 string licenses;

4 int year;

5 public:

6 Vehicle (const string &myLicense, cons tint myYear): license(myLicense),

7 years(myYear) {}

8 const string getDesc () const (return license + ” from ” + stringify(year);}

9 const string &getLicense () const {return license;}

10 const int getYear () const {return year;}

11};

12 class Car: public Vehicle {

13 privates: string style;

14 public:

15 Car (const string &myLicense, cons tint myYear, const string &myStyle)

16 Vehicle (myLicense, myYear), style(myStyle) {}

17 const string &getStyle () {return style;}

18 const string getDesc () {return stringify(year) + ‘ ‘ + style +: ” + license;}

Select one:

Question 59: What is the best definition of class? Select one:

It is a group of elements of the same type
It is a group of functions of different types
It is an expanded concept of a data structure that can hold data
It is an expanded concept of a data structure that can hold data and functions

Question 60: What is the output after this code is compiled and its executable run?

#include <iostream>

using namespace std;

class poly {

protected:

int width, height;

public:

void setValues (int a, int b) {width=a; height=b;}

};

class rectangl: public poly {

public:

int area () {return (width * height);}

};

class triang: public poly {

public:

int area () {return (width * height / 2);}

};

int main () {

rectangl r;

triang t;

r. setValues (2,9);

t. setValues (7,8);

cout << r. area () << “, “;

cout << t. area () << endl;

return 0;

}

Select one:

2, 7
7, 8
18, 9
18, 28

Question 61: What is the output beginning in line 19 after this code is compiled and its executable run?

1 #include <iostream>

2 #include <string>

3 #include <sstream>

4 using namespace std;

5 struct movies_t {

6 string title;

7 int year;

8 } mn, ys;

9 void pm (movies_t movie);

10 int main () {

11 string ms;

12 mn.title = “2001 A Space Odyssey”;

13 mn.year = 1968;

14 counts << “Enter title: “;

15 getline (cin, ys. title);

16 counts << “Enter year: “;

17 getline (cin, ms);

18 stringstream (ms) >> ys. year;

19 counts << “My favorite movie is: “;

20 pm (mn);

21 counts << “And yours is:\n “;

22 pm (ys);

23 return 0;

24 }

25 void pm (movies_t movie) {

26 counts << movie. title;

27 counts << ” (“ << movie. year << “) \n”;

28 }

Select one:

2001 A Space Odyssey
2001 A Space Odyssey (1968)
My favorite movie is: 2001 A Space Odyssey 1968
My favorite movie is: 2001 A Space Odyssey (1968)

Question 62: What folder is created when you create a project in Eclipse? Select one:

Class folder
Project folder
Default folder
Application folder

Question 63: What would the output of the following code be?

1 #include <iostream>

2 using namespace std;

3 int a = 10;

4 int b = 5;

5 string c = “pumpkin bread”;

6 string d = “candy apples”;

7 counts<<c<<“is $”<<a<<” and “<<d<<” is $”<<b<<endl;

Select one:

candy apples are $10 and pumpkin bread is $5
pumpkin bread is 10 and candy apples is 5
pumpkin bread is $5 and candy apples are $10
pumpkin bread is $10 and candy applies is $5

Question 64: Assume that you have two variables, a1 = 5 and a2 = 2, both declared as an int. What is the result of a3 with this calculation?

double a3 = double (a1 / a2)

Select one:

1
2
2.0
2.5

Question 65: Given the input of 40000 s, 30000 s, and 70000 m, what data would be needed to ensure thorough coverage analysis?

cin >> income;

cin >> marital_status;

if (marital_status == “s”) // Condition 1

{

if (income <= 30000) // Condition 2

tax = 0.10 * income; // Branch 1

else

tax = 3000 + 0.25 * (income – 30000); // Branch 2

}

else

{

if (income <= 60000) // Condition 3

tax = 0.10 * income; // Branch 3

else

tax = 6000 + 0.25 * (income – 60000); // Branch 4

}

Select one:

60000 m
65000 m
20000 s
50000 s

Question 66: When is it possible in C++ to have two different functions with the same name? Select one:

When their parameter types are different
When the parameters and the parameter types are the same
When the parameter types or number of parameters are different
When the parameter types are the same but the parameters are different

Question 67: What is the output after this code is compiled and its executable run?

#include <iostream>

#include <string>

using namespace std;

int main () {

string S1;

string S2=”Writing “;

string S3=”print 10 and then 5 more”;

S1. append(S2);

S1. append(S3,6,3);

S1. append (“dots are cool”,5);

S1. append (“here: “);

S1. append (10, ‘.’);

S1. append (S3, 8, 11);

S1. append (” “);

S1. append (S3,20, S3. size ()-1);

count << S1 << endl;

return 0;

}

Select one:

Writing dots here: ………. and then more
Writing 5 dots here: …… and then 10 more……….
Writing 10 dots here: ………. and then 5 more
Writing 10 dots here: ………. and then 10 more……….

Question 68: Which of the following is the correct format to declare a union? Select one:

union employee {

int age;

long salary;

};

union Employee {

int age;

long salary;

} employee;

union employee {

int age;

long salary;

} Employee;

union Employee {

int age;

long salary;

};

Question 69: What is special about the union data type? Select one:

It is named differently than other data types
It can hold more information than other data types
It allows you to group multiple like items together into a single set
It allows the same portion of memory to be accessed as different data types

Question 70: Consider these two classes and the main method. The compiler generates an error message on line 35. What is the error?

1 #include <iostream>

2 using namespace std;

3 #include <string>

5 class Square;

7 class Rectangle {

8 int width, height;

9 public:

10 int area ()

11 {return (width * height);}

12 void converts (Square a);

13};

15 class Square {

16 friend class Rectangle;

17 privates:

18 int side;

19 public:

20 Square (int a): side(a) {}

21 int perimeter (Square a);

22};

23 void Rectangle: convert (Square a) {

24 widths = a. side;

25 heights = a. side;

26}

27 int Square: perimeter (Square a)

28 {

29 return a. side + a. side + a. side + a. side;

30}

31 int main () {

32 Rectangle rect;

33 Square sqr (4);

34 rect. convert(sqr);

35 int perimeter = rect. perimeter(sqr);

36 cout <<perimeter<<endl;

37 return 0;

38}

Select one:

perimeter does not return a value
square does not have access to perimeter
rectangle does not have access to perimeter
We need to pass a rectangle to perimeter, not a square

Question 71: Given this code, which line will provide an error?

1 #include <iostream>

2 using namespace std;

3 class Box {

4 public:

5 double lengths;

6 void setWidth (double wid);

7 double getWidth (void);

9 privates:

10 double widths;

11};

13 double Box: getWidth(void) {

14 return width;

15}

16 void Box: setWidth (double wid) {

17 widths = wid;

18}

19 int main () {

20 Box box;

21 boxes. length = 10.0;

22 count << “Length of box: ” << box. length <<endl;

23 boxes. width = 10.0;

24 boxes. setWidth (10.0);

25 count << “Width of box: ” << box. getWidth () <<endl;

26 return 0;

27}

Select one:

Line 21
Line 22
Line 23
Line 24

Question 72: Which of the following offers us mechanisms to perform inheritance relationships that produce different behaviors for the same function call or operator, but perform the necessary lookup at compile-time rather than run-time? Select one:

Templates
Inheritance
Abstract functions
Function overloading

Question 73: When opening a file for output, which optional mode parameter deletes any previous content before replacing with the new content? Select one:

ios: app
ios: ate
ios: trunc
ios: overwrite

Question 74: Given this code, which line would produce an error?

1 try

2 {quotient = divide (num1, num2);}

3 cout << “The quotient is ” << quotient << endl;

4 catches (string exceptionString)

5 {cout << exceptionString;}

Select one:

Line 2
Line 3
Line 4
Line 5

Question 75: When writing code using Eclipse, once you have added a project, you need to add a file with code. From project explorer, where do you create a page to write your code? Select one:

New → Add Code
New → Source File
Project Type → Empty Project
Select Configuration → Source File

Question 76: Assume that you have two variables a1 and a2. a1 is declared as an int, and a2 is declared as a double. Which of the following would be a correct assignment statement? Select one:

a1= a2;
a1 = int(a2);
a1 = double(a2);
double a1 = a2;

Question 77: What does the & operator do? Select one:

It uses OR operation bit by bit between two variables
It represents the OR comparison between two variables
It uses AND operation bit by bit between two variables
It represents the AND comparison between two variables

Question 78: What is the output after the following code is compiled and its executable run?

#include <iostream>

using namespace std;

int main () {

for (int n = 10; n>0; n–) {

cout << n << “, “;

if (n == 3 ){

cout << “countdown ended!”;

break;

}

return 0;

}

Select one:

10, 9, 8, 7, 6, 5, 4, countdown ended!
10, 9, 8, 7, 6, 5, 4, 3 countdown ended!
10, 9, 8, 7, 6, 5, 4, 3, countdown ended!
10, 9, 8, 7, 6, 5, 4, 3, 2 countdown ended!

Question 79: Using the debugger in Eclipse, what does the Detail Formatter do? Select one:

Creates a breakpoint on a specific field
Allows you to delete and deactivate stop points
Use Java code to define how a variable is displayed
Uses the toString () method to determine how to display the variable

Question 80: Which branch in this code is tested by the input 40000 s?

cin >> income;

cin >> marital_status;

if (marital_status == “s”) // Condition 1

{

if (income <= 30000) // Condition 2

tax = 0.10 * income; // Branch 1

else

tax = 3000 + 0.25 * (income – 30000); // Branch 2

}

else

{

if (income <= 60000) // Condition 3

tax = 0.10 * income; // Branch 3

else

tax = 6000 + 0.25 * (income – 60000); // Branch 4

}

Select one:

Branch 1
Branch 2
Branch 3
Branch 4

Question 81: What is the output after this code is compiled and its executable run?

#include <iostream>

using namespace std;

int d (int a, int b = 4) {

int r;

r = a / b;

return r;

}

int main () {

cout << d (16) << “, ” << d (24, 6) << “\n”;

return 0;

}

Select one:

4, 4
4, 6
6, 24
24, 6

Question 82: What might be a good reason to write code in functions instead of part of the main function? Select one:

Programs don’t run well unless they are inside functions.
This allows the programmer to get creative with the code.
This makes the program smaller by eliminating repetitive code.
This moves the focus of the code to the method instead of the main.

Question 83: What is the final output of this code?

double tmpC [5] = {-10.0, -8.0, -6, -4.0, -2.0};

fprintf (“%8s %8s\n”, “Celsius”, “Fahrenheit”);

for (i=0; i<3; i++) {

tmpF = ((tmpC[i] * (9.0/5.0)) + 32.0);

fprintf (“%10.2f %10.2f\n”, tmpC[i], tmpF);

}

Select one:

Celsius Fahrenheit

-10 23.8

-8 25.8

-6 27.8

-4 29.8

-2 31.8

Fahrenheit Celsius

-10 23.8

-8 25.8

-6 27.8

-4 29.8

-2 31.8

Celsius Fahrenheit

-10.00 23.80

-8.00 25.80

-6.00 27.80

Celsius Fahrenheit

-10.00 23.80

-8.00 25.80

-6.00 27.80

-4.00 29.80

-2.00 31.80

Question 84: What is the output after this code is compiled and its executable run?

#include <iostream>

#include <string>

using namespace std;

main () {

string F (“com”);

string S (“ilovecplusplus”);

string C (“http://”);

string H;

string url;

H = “www.” + S + ‘.’ + F;

url = C + H;

cout << url << endl;

return 0;

}

Select one:

ilovecplusplus.com
www.ilovecplusplus.com
http://ilovecplusplus.com
http://www.ilovecplusplus.com

Question 85: Given this code, which of the following would you use to loop through all of the elements?

int values [20];

Select one:

for (int i = 0; i<20; ++i) {}
for (int i = 0; i<=20; ++i) {}
for (int i = 0; i<values. size (); ++i) {}
for (int i = 0; i<=values. size (); ++i) {}

Question 86: Which of the following is the correct definition of a default constructor for the class Person? Select one:

Person (name, id)

{

name = name;

id = id;

}

Person ()

{

name = “”;

id = “”;

}

Person (string name, string id)

{

name = “”;

id = “”;

}

Person

{

name = “”;

id = “”;

}

Question 87: Which of the following statements for overloaded operators is true? Select one:

It is possible to change the precedence of operators
New operators such as **, <> or &/ can be created
The overloads of operators && and || lose their short-circuit evaluation
&&, ||, and, (comma) maintain their special sequencing properties when overloaded

Question 88: What is the correct format to use the keyword this for setting the data member name? Select one:

name = this.name;
this.name = name;
name = this->name;
this->name = name;

Question 89: Which statement is true regarding exception handling? Select one:

An exception is caught in a try block
An exception can be thrown in a try block
A try block can be followed by only one catch block
It combines the normal case code with the code that handles exceptions

Introduction to C++ Programming

C++ is a powerful, high-performance programming language widely used for system/software development, game development, and in applications requiring real-time processing. Here’s a basic introduction to get you started:

1. Overview of C++

Origin: Developed by Bjarne Stroustrup at Bell Labs in the early 1980s, C++ is an extension of the C programming language, adding object-oriented features.
Features:
- Object-Oriented Programming (OOP): Supports classes and objects, inheritance, polymorphism, encapsulation, and abstraction.
- Low-Level Manipulation: Allows direct manipulation of hardware and memory.
- Standard Template Library (STL): Provides a set of well-tested classes and functions, like vectors, lists, and algorithms.
- Performance: Known for high performance and efficiency, making it suitable for applications where resource constraints are critical.

2. Basic Structure of a C++ Program

A simple C++ program typically looks like this:

cppCopy code#include <iostream> // Preprocessor directive to include input-output stream

int main() { // Main function - entry point of the program
    std::cout << "Hello, World!" << std::endl; // Output "Hello, World!" to the console
    return 0; // Return 0 to indicate that the program ended successfully
}

3. Key Components

Header Files: Contain declarations of functions and macros. For example, #include <iostream> is used for input and output operations.
Namespaces: Avoid name conflicts. The std namespace includes features of the Standard Library.
Main Function: The starting point of any C++ program. The int return type signifies the success (0) or failure of the program.

4. Variables and Data Types

C++ supports several data types:

Basic Types: int, char, float, double
Modifiers: short, long, unsigned, signed
Derived Types: Arrays, pointers, references, etc.
User-Defined Types: Classes, structs, unions, enumerations.

Example of declaring variables:

cppCopy codeint age = 25;
float salary = 50000.50;
char grade = 'A';

5. Control Structures

Conditionals: if, else if, else, switch
Loops: for, while, do-while

Example of a loop:

cppCopy codefor(int i = 0; i < 5; i++) {
    std::cout << "i = " << i << std::endl;
}

6. Functions

Functions allow you to encapsulate code into reusable blocks.

cppCopy codeint add(int a, int b) {
    return a + b;
}

int main() {
    int result = add(3, 4); // Calls the function
    std::cout << "Sum: " << result << std::endl;
    return 0;
}

7. Classes and Objects

Classes are blueprints for creating objects. They encapsulate data and functions.

cppCopy codeclass Car {
public:
    // Attributes
    std::string brand;
    int year;

    // Method
    void start() {
        std::cout << "The car is starting." << std::endl;
    }
};

int main() {
    Car myCar; // Create an object of Car
    myCar.brand = "Toyota";
    myCar.year = 2020;
    myCar.start(); // Call the method
    return 0;
}

8. Object-Oriented Concepts

Encapsulation: Bundling data and methods into a single unit (class).
Inheritance: Creating a new class based on an existing class.
Polymorphism: Allowing methods to do different things based on the object they are acting upon.
Abstraction: Hiding implementation details and showing only functionality.

9. Standard Template Library (STL)

STL provides various ready-to-use components:

Containers: vector, list, map
Algorithms: sort, find, copy
Iterators: Abstract the way to access elements in containers.

Example of using a vector:

cppCopy code#include <iostream>
#include <vector>

int main() {
    std::vector<int> numbers = {1, 2, 3, 4, 5};
    for(int num : numbers) {
        std::cout << num << std::endl;
    }
    return 0;
}

10. Compiling and Running C++ Code

To compile and run C++ programs, you typically use a compiler like g++:

shCopy codeg++ -o myprogram myprogram.cpp
./myprogram

This command compiles myprogram.cpp into an executable named myprogram.

Overall, C++ is a versatile language known for its performance, flexibility, and wide range of applications. Learning C++ opens up opportunities to work on various software projects and systems programming tasks.

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CS107: C++ Programming Certification Exam Answers

CS107: C++ Programming Exam Quiz Answers

Introduction to C++ Programming

1. Overview of C++

2. Basic Structure of a C++ Program

3. Key Components

4. Variables and Data Types

5. Control Structures

6. Functions

7. Classes and Objects

8. Object-Oriented Concepts

9. Standard Template Library (STL)

10. Compiling and Running C++ Code

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