Value Return(C++ Programming ) Questions and answers for exam Preparation

What is the output of this program?

1.
#include
2.
using namespace std;
3.
int gcd (int a, int b)
4.
{
5.
int temp;
6.
while (b != 0) {
7.
temp = a % b;
8.
a = b;
9.
b = temp;
10.
}
11.
return(a);
12.
}
13.
int main ()
14.
{
15.
int x = 15, y = 25;
16.
cout

15
25
375
5

Explanation:-

Answer: Option D. -> 5

In this program, we are finding the gcd of the number.
Output:
$ g++ ret5.cpp
$ a.out
5

Question 2.

When will we use the function overloading?

same function name but different number of arguments
different function name but same number of arguments
same function name but same number of arguments
different function name but different number of arguments

Explanation:-

Answer: Option A. -> same function name but different number of arguments

In function overloading, we can use any number of arguments but same function name.

Question 3.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
int mult (int x, int y)
4.
{
5.
int result;
6.
result = 0;
7.
while (y != 0) {
8.
result = result + x;
9.
y = y - 1;
10.
}
11.
return(result);
12.
}
13.
int main ()
14.
{
15.
int x = 5, y = 5;
16.
cout

20
25
30
35

Explanation:-

Answer: Option B. -> 25

We are multiplying these values by adding every values.
Output:
$ g++ ret.cpp
$ a.out
25

Question 4.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
double & WeeklyHours()
4.
{
5.
double h = 46.50;
6.
double &hours = h;
7.
return hours;
8.
}
9.
int main()
10.
{
11.
double hours = WeeklyHours();
12.
cout

46.5
6.50
compile time error
none of the mentioned

Explanation:-

Answer: Option A. -> 46.5

We are returning the value what we get as input.
Output:
$ g++ ret1.cpp
$ a.out
46.5

Question 5.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
int max(int a, int b )
4.
{
5.
return ( a > b ? a : b );
6.
}
7.
int main()
8.
{
9.
int i = 5;
10.
int j = 7;
11.
cout

5
7
either a or b
none of the mentioned

Explanation:-

Answer: Option B. -> 7

In this program, we are returning the maximum value by using conditional operator.
Output:
$ g++ ret.cpp
$ a.out
7

Question 6.

Where does the return statement returns the execution of the program?

main function
caller function
same function
none of the mentioned

Explanation:-

Answer: Option B. -> caller function

None.

Question 7.

What will you use if you are not intended to get a return value?

static
const
volatile
void

Explanation:-

Answer: Option D. -> void

Void is used to not to return anything.

Question 8.

How many types of returning values are present in c++?

1
2
3
4

Explanation:-

Answer: Option C. -> 3

The three types of returning values are return by value, return by reference and return by address.