Operator - Source Code 01

Add two Number
Source Code 1
#include <stdio.h>
int sum(int a , int b);
void main()
{
int x,y;
printf("input two numbers!\n");
scanf("%d %d",&x,&y);
printf("sum is %d\n",sum(x,y));
}
int sum(int a , int b)
{
return a+b;
}
Source Code 2
#include <stdio.h>
int Add(int i, int j)
{
    int result = i + j;
    return result;
}
int main(void)
{
    int d;
    d = Add(3, 4);
    printf("%d \n", d);
    return 0;
}