Questions and answers for exam Preparation

MCQs

Total Questions : 10

What is the output of this program?

1.
#include
2.
using namespace std;
3.
void Sum(int a, int b, int & c)
4.
{
5.
a = b + c;
6.
b = a + c;
7.
c = a + b;
8.
}
9.
int main()
10.
{
11.
int x = 2, y =3;
12.
Sum(x, y, y);
13.
cout

2 3
6 9
2 15
compile time error

Discuss Question

Answer: Option C. -> 2 15

We have passed three values and it will manipulate according to the given condition and yield

the result as 2 15
Output:
$ g++ arg.cpp
$ a.out
2 15

Question 2.

What will happen when we use void in argument passing?

It will not return value to its caller
It will return value to its caller
both a & b are correct
none of the mentioned

Discuss Question

Answer: Option A. -> It will not return value to its caller

As void is not having any return value, it will not return the value to the caller.

Question 3.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
int add(int a, int b);
4.
int main()
5.
{
6.
int i = 5, j = 6;
7.
cout

11
12
13
compile time error

Discuss Question

Answer: Option C. -> 13

The value of a has been changed to 7, So it returns as 13.
Output:
$ g++ arg1.cpp
$ a.out
13

Question 4.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
void square (int *x)
4.
{
5.
*x = (*x + 1) * (*x);
6.
}
7.
int main ( )
8.
{
9.
int num = 10;
10.
square(&num);
11.
cout

100
compile time error
144
110

Discuss Question

Answer: Option D. -> 110

We have increased the x value in operand as x+1, so it will return as 110.
Output:
$ g++ arg2.cpp
$ a.out
110

Question 5.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
long FACTORIAL (long a)
4.
{
5.
if (a > 1)
6.
return (a * factorial (a + 1));
7.
else
8.
return (1);
9.
}
10.
int main ()
11.
{
12.
long num = 3;
13.
cout

6
24
segmentation fault
compile time error

Discuss Question

Answer: Option C. -> segmentation fault

As we have given in the function as a+1, it will exceed the size and so it arises the segmentation fault.
Output:
$ g++ arg3.cpp
$ a.out
segmentation fault

Question 6.

What is the new value of x?

1.
#include
2.
using namespace std;
3.
void fun(int &x)
4.
{
5.
x = 20;
6.
}
7.
int main()
8.
{
9.
int x = 10;
10.
fun(x);
11.
cout

10
20
15
none of the mentioned

Discuss Question

Answer: Option B. -> 20

As we passed by reference, the value is changed and it is returned as 20.
Output:
$ g++ arg5.cpp
$ a.out
20

Question 7.

By default how the value are passed in c++?

call by value
call by reference
call by pointer
none of the mentioned

Discuss Question

Answer: Option A. -> call by value

None.

Question 8.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
void copy (int& a, int& b, int& c)
4.
{
5.
a *= 2;
6.
b *= 2;
7.
c *= 2;
8.
}
9.
int main ()
10.
{
11.
int x = 1, y = 3, z = 7;
12.
copy (x, y, z);
13.
cout