149+ C++ Interview MCQ Questions and Answers with Explanation

Q:

What is meaning of following declaration?
int(*p[5])();

A) p is pointer to function.	B) p is array of pointer to function.
C) p is pointer to such function which return type is array.	D) p is pointer to array of function.

Answer & Explanation Answer: B) p is array of pointer to function.

Explanation:

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Q:

Which of the following is a properly defined structure?

A) struct {int a;}	B) struct a_struct {int a;}
C) struct a_struct int a;	D) struct a_struct {int a;};

Answer & Explanation Answer: D) struct a_struct {int a;};

Explanation:

The a_struct is declared as structure name and its data element is a.

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Q:

Which is more effective while calling the functions?

A) call by value	B) call by reference
C) call by pointer	D) none

Answer & Explanation Answer: B) call by reference

Explanation:

In the call by reference, it will just copy the address of the variable to access it, so it will reduce the memory in accessing it.

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Q:

What is function prototyping? What are its advantages?

Answer

Function prototyping is a function declaration statement that tells the compiler about the return type of the function and the number as well as type of arguments required by the function at the time of calling it.

Syntax:

return_type function_name( type1 arg1, type 2 arg2, ... );

Advantages of function prototype :

- It helps the compiler in determining whether a function is called correctly or not. Each time when a function is called, its calling statement is compared with its prototype. In case of any mismatch, compiler reports an error.

- A function must be defined before calling it. But prototyping allows a function to be called before defining it.

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Q:

Which of the following gives the memory address of the first element in array?

A) array[0];	B) array[1];
C) array(2);	D) array;

Answer & Explanation Answer: D) array;

Explanation:

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Q:

What is the output of this program ?

       #include
        using namespace std;
        int n(char, int);
        int (*p) (char, int) = n;
        int main()
        {
            (*p)('d', 9);
            p(10, 9);
            return 0;
        }
        int n(char c, int i)
        {
            cout << c << i;
            return 0;
        }

A) d99	B) d9d9
C) d9	D) compile time error

Answer & Explanation Answer: A) d99

Explanation:

In this program, we have declared the values as integer instead of character, So it is printing as d99 but it will not arise an error.

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Q:

What is the default return type of a function ?

A) int	B) void
C) float	D) char

Answer & Explanation Answer: B) void

Explanation:

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Q:

In tree construction which is the suitable efficient data structure?

A) Array	B) Linked list
C) Stack	D) Queue

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