C++ Template Aptitude Questions and Answers

1) There are the following statements that are given below, which of them are correct about templates in C++?

1. The template is a new feature in C++; templates do not exist in C language.
2. The template is used for generic programming.
3. The template is a special class which used to store data elements.
4. All the above

Options:

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

2) We can implement templates as a?

1. Class templates
2. Function templates
3. Enumeration templates
4. Pointer templates

Options:

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

3) There are following options are given below, which of them is correct syntax of function templates in C++?

1. templates <class type> return type function_name(parameter_list) { }
2. Template <class type> return type function_name(parameter_list) { }
3. Templates <class type> return type function_name(parameter_list) { }
4. template <class type> return type function_name(parameter_list) { }

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

#include <iostream>
using namespace std;

template <class T>
T sum(T num1, T num2)
{
    T C = num1 + num2;

    return C;
}

int main()
{
    int A = 5;
    int B = 10;

    double X = 3.5;
    double Y = 4.6;

    cout << sum(A, B) << " " << sum(X, Y) << endl;

    return 0;
}

Options:

1. 15 8.1
2. 15 8
3. Garbage values
4. Syntax error

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

#include <iostream>
using namespace std;

template <class T>
int sum(T num1, T num2)
{
    T C = num1 + num2;

    return C;
}

int main()
{
    int A = 5;
    int B = 10;

    double X = 3.5;
    double Y = 4.6;

    cout << sum(A, B) << " " << sum(X, Y) << endl;

    return 0;
}

Options:

1. 15 8.1
2. 15 8
3. Garbage values
4. Syntax error

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

#include <iostream>
using namespace std;

template <class T1>
int sum(T1 num1, T1 num2)
{
    T1 C = num1 + num2;

    return C;
}

int main()
{
    int A = 5;
    int B = 10;

    double X = 3.5;
    double Y = 4.6;

    cout << sum(A, B) << " " << sum(X, Y) << endl;

    return 0;
}

Options:

1. 15 8.1
2. 15 8
3. Garbage values
4. Syntax error

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

#include <iostream>
using namespace std;

<class T> template int sum(T num1, T num2)
{
    T C = num1 + num2;

    return C;
}

int main()
{
    int A = 5;
    int B = 10;

    double X = 3.5;
    double Y = 4.6;

    cout << sum(A, B) << " " << sum(X, Y) << endl;

    return 0;
}

Options:

1. 15 8.1
2. 15 8
3. Garbage values
4. Syntax error

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

#include <iostream>
using namespace std;

template <class X, class Y>
Y sum(X num1, Y num2)
{
    Y C = num1 + num2;

    return C;
}

int main()
{
    int A = 5;
    int B = 10;

    double X = 3.5;
    double Y = 4.6;

    cout << sum(A, Y) << endl;

    return 0;
}

Options:

1. 9
2. 9.6
3. Garbage values
4. Syntax error

9) Can we overload template functions in C++?

1. Yes
2. No

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

#include <iostream>
using namespace std;

class template <class T>
Sample
{
    T a;
    T b;

public:
    Sample(T a, T b)
    {
        this->a = a;
        this->b = b;
    }
    void print()
    {
        cout << a << " " << b << endl;
    }
};

int main()
{
    Sample<int> S(10, 20);

    S.print();

    return 0;
}

Options:

1. 10 20
2. Garbage values
3. Syntax error
4. Runtime exception

11) What is the correct output of given code snippets in C++?

#include <iostream>
using namespace std;

template <class T>
class Sample {
    T a;
    T b;

public:
    Sample(T a, T b)
    {
        this->a = a;
        this->b = b;
    }
    void print()
    {
        cout << a << " " << b << endl;
    }
};

int main()
{
    Sample<int> S(10, 20);

    S.print();

    return 0;
}

Options:

1. 10 20
2. Garbage values
3. Syntax error
4. Runtime exception

12) What is the correct output of given code snippets in C++?

#include <iostream>
using namespace std;

template <class T, int b>
class Sample {
    T a;

public:
    Sample(T a)
    {
        this->a = a;
    }
    void print()
    {
        cout << a << " " << b << endl;
    }
};

int main()
{
    Sample<int, 20> S(10);

    S.print();

    return 0;
}

Options:

1. 10 20
2. Garbage values
3. Syntax error
4. Runtime exception