Argument Passing(C++ Programming ) Questions and answers for exam Preparation

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

Explanation:-

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

Explanation:-

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

Explanation:-

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

Explanation:-

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

Explanation:-

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

Explanation:-

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

Explanation:-

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

2 5 10
2 4 5
2 6 14
none of the mentioned

Explanation:-

Answer: Option C. -> 2 6 14

Because we multiplied the values by 2 in the copy function.
Output:
$ g++ arg6.cpp
$ a.out
x = 2,y = 6,z = 14

Question 9.

How many ways of passing a parameter are there in c++?

1
2
3
4

Explanation:-

Answer: Option C. -> 3

There are three ways of passing a parameter. They are pass by value,pass by reference and

pass by pointer.

Question 10.

Which is used to keep the call by reference value as intact?

static
const
absolute
none of the mentioned

Explanation:-

Answer: Option B. -> const

Because const will not change the value of the variables during the execution.