无标题.jpg
#include <stdio.h>
int main(){
int N;
int sum; //保存幻数和
int shuzi;
int i;
scanf("%d", &N);
for (i=1;i<=N;i++){
if (i % 7 == 0) {
sum += i;
printf("%d ", i);
}
else {
shuzi = i;
while (shuzi>10){
if (shuzi % 10 == 7){
sum += shuzi;
printf("%d ", shuzi);
break;
}
shuzi = shuzi / 10;
}
}
}
printf("\n从1到%d的幻数之和：%d", N, sum);
}
