How to add two integer in C

#include <stdio.h>

int main()

{

   int a,b,sum;

   printf("Please Enter the 1st Number: ");

   scanf("%d",&a);

   printf("Please Enter the 2nd Number: ");

   scanf("%d",&b);

   sum=a+b;

   printf("The sum of %d and %d is: %d",a,b,sum);

   return 0;

}