Use of cin in C++ :

• cin is used for accepting data from the keyboard/user.
• The operator >> called as extraction operator or get from operator.
• Extraction operator is similar to the scanf() operation in C.
• cin is the object of istream class.

Example of cin :

              #include<iostream.h>

              #include<conio.h>

void main(){

              clrscr();

              int n1,n2;

              cout<<"Enter 1st Number : ";

              cin>>n1;                                              // accept 1st number

              cout<<"Enter 2nd Number : ";

              cin>>n2;                                             // accept 2nd number

              cout<<"Addition = "<<n1+n2;               //Display addition of 2 numbers

getch();

}

Output: 

                    For Example: User Enter Numbers 

 Enter 1st Number : 10

 Enter 2nd Number : 20

Addition = 30