C++ Default Arguments Aptitude Questions and Answers

1) There are the following statements that are given which of them are correct about default arguments in C++?

1. The default arguments are used in C++ functions to provide optional arguments.
2. If we did not pass the value to the function then default values of arguments used inside the function, if argument declared as a default argument.
3. We can create any argument in the function as a default argument.
4. Default arguments sometimes reduce the creation of multiple functions using function overloading.

Options:

1. A and B
2. A and C
3. A, B, and D
4. A, B, C, and D

2) What is the correct output of the given code snippets?

#include <iostream>
using namespace std;

void fun(int a, int b = 10, int c = 20)
{
    cout << a << " " << b << " " << c << endl;
}

int main()
{
    fun(5);
    fun(5, 12);
    fun(5, 12, 17);

    return 0;
}

Options:

1. 5 
   5 12
   5 12 17
   

2. 5 10 20
   5 12 20
   5 12 17
   

3. Compile-time error
4. Runtime error

5 10 20
5 12 20
5 12 17

3) What is the correct output of the given code snippets?

#include <iostream>
using namespace std;

void fun(int a = 10, int b)
{
    cout << a << " " << b << endl;
}

int main()
{
    fun(5);

    return 0;
}

Options:

1. 5
2. 5 10
3. Compile-time error
4. Runtime error

4) What is the correct output of the given code snippets?

#include <iostream>
using namespace std;

void fun(int a, int* b = 100)
{
    cout << a << " " << b << endl;
}

int main()
{
    fun(5);

    return 0;
}

Options:

1. 5
2. 5 100
3. Compile-time error
4. Runtime error

5) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

void fun(int a, int* b = &a)
{
    cout << a << " " << *b << endl;
}

int main()
{
    fun(5);

    return 0;
}

Options:

1. 5
2. 5 5
3. Compile-time error
4. Runtime error

6) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

int c = 10;
void fun(int a, int* b = &c)
{
    cout << a << " " << *b << endl;
}

int main()
{
    fun(5);

    return 0;
}

Options:

1. 5
2. 5 10
3. Compile-time error
4. Runtime error

7) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

void fun(int X, long Y)
{
    cout << "##: " << X << " " << Y << endl;
}

void fun(int a, int b = 10)
{
    cout << "$$: " << a << " " << b << endl;
}

int main()
{
    fun(5, 20);

    return 0;
}

Options:

1. $$: 5 20
2. ##: 5 20
3. Compile-time error
4. Runtime time

8) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

void fun(int X, long Y)
{
    cout << "##: " << X << " " << Y << endl;
}

void fun(int a, int b = 10)
{
    cout << "$$: " << a << " " << b << endl;
}

int main()
{
    fun(5, 20L);

    return 0;
}

Options:

1. $$: 5 20
2. ##: 5 20
3. Compile-time error
4. Runtime error

9) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

void fun(int X, int Y)
{
    cout << "##: " << X << " " << Y << endl;
}

void fun(int a = 8, int b = 10)
{
    cout << "$$: " << a << " " << b << endl;
}

int main()
{
    fun('A', 20);

    return 0;
}

Options:

1. $$: A 20
2. $$: 65 20
3. ##: 65 20
4. Compile-time error

10) What is the correct output of given code snippets?

#include <iostream>
using namespace std;

int k = 30;

void fun(int a, int& b = k)
{
    cout << a << " " << b << endl;
}

int main()
{
    fun(8);

    return 0;
}

Options:

1. 8 30
2. 8
3. Compile-time error
4. Garbage value