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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++

Q:

What is default constructor?

Answer


A default constructor is a constructor that either has no parameters, or if it has parameters, all the parameters have default values.

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Subject: C++

Q:

What is copy constructor?

Answer


Copy constructor is a constructor function with the same name as the class and used to make deep copy of objects.

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Subject: C++

Q:

What are storage qualifiers in C++ ?

Answer

ConstKeyword indicates that memory once initialized, should not be altered by a program.
Volatile keyword indicates that the value in the memory location can be altered even though nothing in the program.
Mutable keyword indicates that particular member of a structure or class can be altered even if a particular structure variable, class, or class member function is constant.

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Subject: C++

Q:

what is the use of virtual destructor in c++?

Answer

A destructor is automatically called when the object is destroyed. A virtual destructor in C++ is used primarily to prevent resource leaks by performing a clean-up of the object.

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Subject: C++

Q:

Write a c program to check whether a number is strong or not.

Answer

#include<stdio.h>
int main(){
  int num,i,f,r,sum=0,temp;

  printf("Enter a number: ");
  scanf("%d",&num);
 
  temp=num;
  while(num){
      i=1,f=1;
      r=num%10;

      while(i<=r){
         f=f*i;
        i++;
      }
      sum=sum+f;
      num=num/10;
  }
  if(sum==temp)
      printf("%d is a strong number",temp);
  else
      printf("%d is not a strong number",temp);

  return 0;
}

Sample output:
Enter a number: 145
145 is a strong number

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Subject: Programming

Q:

What will be output when you will execute following c code?

#include <stdio.h>
void main()

{
    int const SIZE = 5;
    int expr;
    double value[SIZE] = { 2.0, 4.0, 6.0, 8.0, 10.0 };
    expr=1|2|3|4;
    printf ( "%f", value[expr] );
}

A) 2.000000 B) 4.000000
C) 8.000000 D) Compilation error
 
Answer & Explanation Answer: D) Compilation error

Explanation:

Size of any array in c cannot be constantan variable.

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Filed Under: Programming

Q:

What will be output of the following c program ?

#include

int main()

{

    int max-val=100;

    int min-val=10;

    int avg-val;

    avg-val =( max-val + min-val ) / 2;

    printf( "%d", avg-val );

    return 0;

}

A) 55 B) 105
C) 60 D) Compilation error
 
Answer & Explanation Answer: D) Compilation error

Explanation:

We cannot use special character – in the variable name.
Variable name can have only underscore.

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Filed Under: Programming