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C++ | C Plus Plus Interview Questions for 2022

1) Write a program in C++ to print "Hello World"?

#include <iostream.h>    

#include <conio.h>  

void main()   

{    

  clrscr();    

  cout << "Hello World";  

  getch();    

}

2) Write a program in C++ to enter two integers and find their sum and average ?

#include <iostream.h>  

#include <conio.h>  

void main()  

{  

clrscr();  

int x,y;  

float sum,average;  

cout << "Enter 2 integers : " << endl;  

cin>>x>>y;  

sum=x+y;  

average=sum/2;  

cout <<"The sum is:"<< sum << endl;  

cout <<"The average is:"<< average << endl;  

getch();  

}

3) Write a program in C++ to enter a string and find its length ?

#include<iostream.h>  

#include<conio.h>  

#include<string.h>  

void main()  

{  

clrscr();  

int slength;  

char c[50];  

cout<<"Enter the string"<<endl;  

cin>>c;  

slength=strlen(c);  

cout<<"The length of string is:"<<slength;  

getch();  

}

4) Define basic type of variables used in C++?

There are four types of variables:
  • Bool: It is used to store boolean values (true or false).
  • Char: It is used to store character types.
  • int : It is used to store integer values.
  • float and double: Variables with large and floating point value.

5) What are the different types of Loops in C++ ?

There are three types of loops in C++:
  • For Loop.
  • While loop.
  • Do-while loop.

6) What are the types of storage classes in C++?

There are five types of storage classes in C++:
  • Automatic.
  • Register.
  • Static.
  • External.
  • Mutable.

7) What are the tokens in C++?

The smallest unit of a program is known as tokens. It has the following tokens:
  • Identifiers.
  • Strings.
  • Keywords.
  • Operators.
  • Constants.

8) Does C++ has automatic garbage collection mechanism?

No,It doesn't have automatic garbage collection.

9) Does constructor throws an exception?

No.

10) How "Late binding" is implemented in C++?

By using Virtual tables.

11) What is the use of continue statement in C++?

Example :
#include <iostream>    

using namespace std;    

int main()    

{    

for(int i=1;i<=3;i++)  

{          

for(int j=1;j<=3;j++)  

{          

if(i==2&&j==2)  

{          

continue;          

}          

cout<<i<<" "<<j<<"\n";                    

}          

}              

}

12) What is the use of break statement in C++?

Example:
#include <iostream>    

using namespace std;    

int main()  

 {    

for (int i = 1; i <= 10; i++)      

 {      

 if (i == 5)      

 {      

break;      

 }      

 cout<<i<<"\n";      

}      

}

13) Which inheritance type is used in the class given below?

class A : public X, public Y  

{}
Multiple inheritance type is used in the class.

14) Write a program in C++ to check the number is prime number or not?

Example of Prime Number:
#include <iostream>    

using namespace std;    

int main()    

{    

int n, i, m=0, flag=0;    

cout << "Enter the Number: ";    

cin >> n;    

m=n/2;    

for(i = 2; i <= m; i++)    

{    

if(n % i == 0)    

{    

cout<<"Number is not Prime."<<endl;    

flag=1;    

break;    

}    

}    

if (flag==0)    

cout << "Number is Prime."<<endl;    

return 0;    

}

15) What will be the output of the following code snippet?

#include <iostream>    

using namespace std;    

void func()  

 {      

 static int i=0; //static variable      

 int j=0; //local variable      

  i++;      

 j++;      

 cout<<"i=" << i<<" and j=" <<j<<endl;      

}      

int main()    

{    

 func();      

 func();      

 func();      

}
Output:
i= 1 and j= 1
i= 2 and j= 1
i= 3 and j= 1



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