题解 | 牛牛数数

#include <stdbool.h>
#include <stdio.h>

int main() {
    int n;
    scanf("%d", &n);

    for (int i = 1; i <= n; i++){
        if ((i % 4 == 0)){
            continue;
        }

        int shu = i;
        bool pandun = true;
        while (shu) {
            if (shu % 10 == 4){
                pandun = false;
                break;
            }
            shu /= 10;
        }
        if (pandun){
            printf("%d\n", i);
        }
    }
    return 0;
}