C program to add two numbers

#include <stdio.h>
int main() {

    int firstNumber, secondNumber, sum;

    printf("Enter two integers to add: ");
    scanf("%d %d %d", &firstNumber, &secondNumber);

    // calculating the sum
    sum = firstNumber + secondNumber;

     // displaying sum
    printf("Sum of two numbers is %d", sum);
    return 0;
}