C++ Quizzes

Front 1

Declare a variable to store the letter grade of a student.

int grade;
short grade;
char grade;
All of above
bool grade;

Back 1

char grade;

Front 2

What will be stored in x by the following?
float x;
x = (1 / 2)* 13;

0
7.5
6
6.5

Back 2

0

Front 3

What is the standard output object in C++?
cin
cout
output
print

Back 3

cout

Front 4

What is the outcome of 45 % 2 ?
0
1
22
23
22.5

Back 4

1

Front 5

3. What is pre-processor?

It prepares the program for compilation.
It is the same as the compiler.
It is the main function
It is the name space needed to do standard I/O.

Back 5

It prepares the program for compilation.

Front 6

What will be stored in sum?

int m, n, sum = 0;
m = 12;
n = 10;
m > n ? sum = m + n : sum = m – n;

22
120
2
0
none of above.

Back 6

22

Front 7

What will be displayed by:
int n = 10;
int m = 12;
if(n >= 10)
cout << “good!”;
else if (m >= n)
cout << “bad!”;
else
cout << “OK”;

good!
bad!
OK
good! And bad!

Back 7

good!

Front 8

What will be stored in c by:
Assume that:
int a, b, c = 0;
a = 5;
b = 8;
c = b * a++;

40
45
48
0

Back 8

40

Front 9

What will be displayed by:
int grade = 72;
if (grade >= 90)
cout << “Congratulations! \n”;
cout << “You got an A!! \n”;

Nothing
Congratulations! , You got an A!!
You got an A!!
Congratulations!
Results in error.

Back 9

You got an A!!

Front 10

Which statement will read a value into integer variable data?

a) cout << data;
b) cin << data;
c) cin >> data;
d) cin >> data >> endl;
e) read >> data;

Back 10

c) cin >> data;

Front 11

What will be displayed?

int n, sum = 0;
for (n = 0; n <= 10; n++)
sum = sum + n;

cout << n << endl;

Sum of numbers 0 to 10
0
10
1
None of above

Back 11

None of above

Front 12

Fill in the blank. The goal is to keep prompting the user, until the user enters a positive number > 0.
int num;
do {
cout <<“Enter a positive number:”;
cin >> num;
} while (----------);

num <= 0
num < 0
num > 0
num >= 0
num != 0

Back 12

num <= 0

Front 13

What will be displayed by: (careful!!)
int n = 100;
int sum = 0;
do {
n = n + 10;
sum = sum + n;
} while (n <= 100);
cout << sum << endl;

Nothing
100
110
0

Back 13

110

Front 14

What is the outcome of this code?
int n, sum;
n = 1;
sum = 0;
while (n >= 10)
{
sum = sum + n;
n++;
}
a) Will add up all the numbers from 1 to 10 in sum.
b) This is an infinite loop!
c) The loop will not execute at all!
d) None of above

Back 14

c) The loop will not execute at all!

Front 15

What will be displayed by:
int n, sum = 0;
for (n = 0; n <= 10; n += 3)
{
cout << n << endl;
}


0, 1, 2, 3, … 10
0, 3, 6, 9
0, 3, 6, 9, 12
0, 3, 6, 9, 10
1, 4, 7, 10

Back 15

0, 3, 6, 9

Front 16

Consider the Employee class explained in Lab09. Declare an employee object Jim of this class.

Employee Jim;
Employee emp;
class Employee Jim;
String Jim;

Back 16

Employee Jim;

Front 17

In inheritance
The child class inherits all the private members of the parent.
The child class inherits all the public members of the parent.
The child class may have its own data members.
The child class may have its own methods.
all of above!

Back 17

all of above!

Front 18

3) Assume that class B is derived from class A. What can you say about these classes?

A is the parent class
B is the child class
B is an A
A is a B
a, b, and c

Back 18

a, b, and c

Front 19

4. Given the class Animal, and the following declarations:
Animal lion;
Animal * ptr;
Which statement makes ptr, point to lion?
ptr = &lion;
ptr = *lion;
ptr = lion;
Ptr -> lion;

Back 19

ptr = &lion;

Front 20

Consider the Animal class. Declare an array zoo to store 50 animal objects.

string zoo[50];
int zoo[5];
Animal [] zoo;
Animal zoo[50];
None of above.

Back 20

Animal zoo[50];