求能被7整除且至少有一位数字为3的三位数

#include<stdio.h>int main(){int i;int a,b,c;int sum = 0;for(i = 100;i < 1000;i++){a = i /100;b = (i % 10) / 10;c = i % 10;if(((i % 7) == 0)){if((a == 3) || (b == 3) || (c == 3)){printf("i is %d\n",i);sum += i;}}}printf("sum is %d\n",sum);return 0;}