Simple Addition in C Programming

I have here a code that allows the user to input two numbers and then sum up their values. I'm using C-Free as my compiler.

#include

   int main()

{

int add1, add2, sum;

printf("Enter the first number.\n");

scanf("%d", &add1);

printf("Enter the second number.\n");

          scanf("%d",&add2);

sum=add1+add2;

printf("%d", sum);

          return 0;
}