Example 1: c program to add two numbers # include <stdio.h> int main ( ) { int number1 , number2 , sum ; printf ( "Enter two integers: " ) ; scanf ( "%d %d" , & number1 , & number2 ) ; // calculating sum sum = number1 + number2 ; printf ( "%d + %d = %d" , number1 , number2 , sum ) ; return 0 ; } Example 2: add 2 numbers in c # include <stdio.h> int main ( ) { int a , b , sum ; printf ( "\nEnter two no: " ) ; scanf ( "%d %d" , & a , & b ) ; sum = a + b ; printf ( "Sum : %d" , sum ) ; return ( 0 ) ;