Questions and answers for exam Preparation

MCQs

Total Questions : 10

Question 1.

What are the advantages of passing arguments by reference?

Changes to parameter values within the function also affect the original arguments.
There is need to copy parameter values (i.e. less memory used)
There is no need to call constructors for parameters (i.e. faster)
All of the mentioned

Discuss Question

Answer: Option D. -> All of the mentioned

None.

Question 2.

When our function doesn't need to return anything means what will we use/send as

parameter in function?

void
blank space
both a & b
none of the mentioned

Discuss Question

Answer: Option B. -> blank space

None.

Question 3.

What will happen while using pass by reference

The values of those variables are passed to the function so that it can manipulate them
The location of variable in memory is passed to the function so that it can use the same memory area for its processing
The function declaration should contain ampersand (& in its type declaration)
All of the mentioned

Discuss Question

Answer: Option B. -> The location of variable in memory is passed to the function so that it can use the same memory area for its processing

In pass by reference, we can use the function to access the variable and it can modify it.

Therefore we are using pass by reference.

Question 4.

Overloaded functions are

Very long functions that can hardly run
One function containing another one or more functions inside it.
Two or more functions with the same name but different number of parameters or type.
none of the mentioned

Discuss Question

Answer: Option C. -> Two or more functions with the same name but different number of parameters or type.

None.

Question 5.

What is the output of the following program?

1.
#include
2.
using namespace std;
3.
int operate (int a, int b)
4.
{
5.
return (a * b);
6.
}
7.
float operate (float a, float b)
8.
{
9.
return (a / b);
10.
}
11.
int main()
12.
{
13.
int x = 5, y = 2;
14.
float n = 5.0, m = 2.0;
15.
cout

10.0 5.0
5.0 2.5
10.0 5
10 2.5

Discuss Question

Answer: Option D. -> 10 2.5

In this program, we are divide and multiply the values.
Output:
$ g++ over3.cpp
$ a.out
10 2.5

Question 6.

What is the output of this program?

1.
#include
2.
using namespace std;
3.
int Add(int X, int Y, int Z)
4.
{
5.
return X + Y;
6.
}
7.
double Add(double X, double Y, double Z)
8.
{
9.
return X + Y;
10.
}
11.
int main()
12.
{
13.
cout