c语言编程求1到n中能被3或7整除的数之和。用 do while循环语句完成本题。谢谢

#include int main(void) { int n; int i = 0; int sum = 0; printf("请输入n:"); scanf("%d",&n); do { if(i%3==0||i%7==0) sum = sum+i; i++; }while(i<=n); printf("1到%d中能被3或7整除的数之和sum=%d\n",n,