计算3个数字的和运算

#include <stdio.h>

int sum(int a,int b, int c)
{
     int sum1;
     sum1=a+b+c;
      return sum1;
}
int main(void) 

{ 

     int a, b, c; 

     scanf("%d%d%d", &a, &b, &c); 

     printf("%d\n", sum(a, b,c)); return 0; 

}