Interview Questions

Q:

What do you mean by early binding?

Answer

Early binding refers to the events that occur at compile time. Early binding occurs when all information needed to call a function is known at compile time. Examples of early binding include normal function calls, overloaded function calls, and overloaded operators. The advantage of early binding is efficiency.

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Subject: C++

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Q:

What do you mean by multiple inheritance in C++ ?

Answer

Multiple inheritance is a feature in C++ by which one class can be of different types. Say class teaching Assistant is inherited from two classes say teacher and Student.

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Subject: C++

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Q:

What is the difference between realloc() and free()?

Answer

The free subroutine frees a block of memory previously allocated by the malloc subroutine. Undefined results occur if the Pointer parameter is not a valid pointer. If the Pointer parameter is a null value, no action will occur. The realloc subroutine changes the size of the block of memory pointed to by the Pointer parameter to the number of bytes specified by the Size parameter and returns a new pointer to the block. The pointer specified by the Pointer parameter must have been created with the malloc, calloc, or realloc subroutines and not been deallocated with the free or realloc subroutines. Undefined results occur if the Pointer parameter is not a valid pointer.

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Subject: C++

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Q:

What is the difference between class and structure?

Answer

Structure: Initially (in C) a structure was used to bundle different type of data types together to perform a particular functionality. But C++ extended the structure to contain functions also. The major difference is that all declarations inside a structure are by default public.
Class: Class is a successor of Structure. By default all the members inside the class are private.

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Subject: C++

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Q:

What is the output of this program?

 #include
       using namespace std;
       int main()
       {
           int arr[] = {4, 5, 6, 7};
           int *p = (arr + 1);
           cout << arr;
           return 0;
       }

A) 4 B) 5
C) address of arr D) 7
 
Answer & Explanation Answer: C) address of arr

Explanation:

As we couted to print only arr, it will print the address of the array.

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Q:

What is the output of this program?

#include
        using namespace std;
        struct sec {
            int a;
            char b;
        };
        int main()
        {
            struct sec s ={25,50};
            struct sec *ps =(struct sec *)&s;
            cout << ps->a << ps->b;
            return 0;
        }

A) 252 B) 253
C) 254 D) 262
 
Answer & Explanation Answer: A) 252

Explanation:

In this program, We are dividing the values of a and b, printing it.

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Q:

What is function prototype in C++?

Answer

A function prototype is a declaration of a function that omits the function body. It specifies the function’s name, argument types and return type.


E.g. int add(int,int)

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Subject: C++
Job Role: Software Architect

0 3339
Q:

Define Structure in C++.?

Answer

The C++ programming technique allows defining user defined datatypes through structure. The


syntax to declare structure is as follows:


struct student


{


char name[100]


char address[250]


};

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Subject: C++

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