怎么弄啊这个，不大懂，请问下

#include <stdio.h>
int main()
{
    int n,a,b,c;
    scanf("%d",&n);
    a = n/100;
    b = n%100/10;
    c = n%10;
    printf("result = %d+%d+%d=%d",a,b,c,a+b+c);
    return 0;
}