To add the two integers in C, you need three variables: two variables to store two different numbers and a third variable to store the sum of those two numbers.
Program
#include <stdio.h>
int main(void) {
int a = 40;
int b =10 ;
printf("first number is %d ", a );
printf("second number is %d ", b);
int sum = a + b;
printf("sum of two numbers is %d" , sum);
return 0;
}
Output
first number is 40
second number is 10
sum of two numbers is 50