程序代码：

#include <stdio.h>

#define N 800
#define NOZERO 7

int count(int n);
int ten_pow(int n);

int main(tmpoid) {
    int n = 0, i, t, v;

    while(++n <= N) {
        t = n;
        i = count(t);

        while(i--) {
            v = ten_pow(i);
            if(NOZERO == t / v) break;

            t %= v;
        }

        if(t < 10 && t != NOZERO) printf("%d ", n);
    }

    return 0;
}

int count(int n) {
    int i = 1;

    while(n >= 10) {
        n /= 10;
        i++;
    }

    return i;
}

int ten_pow(int n) {
    int v = 1;

    while(n--) v *= 10;

    return v;
}

程序代码：

#include <stdio.h>
#define N 1000
#define NUM 0

int main(void) {
    int n = 0, t;

    while(++n <= N) {
        t = n;

        while(t >= 10) {
            if(t % 10 == NUM) t = NUM;

            else {
                t /= 10;

                if(t % 10 == NUM) t = NUM;
            }
        }

        if(t != NUM) printf("%d ", n);
    }


    return 0;
}

程序代码：

#include <stdio.h>
#define N 1000
#define NUM 7

int foo(int n) {
    if(n < 10) return n != NUM ? 1 : 0; 
    return foo(n % 10 != NUM ? n / 10 : NUM);
}

int main(void) {
    int n = 0;
    while(++n <= N)
        if(foo(n)) printf("%d ", n);
    return 0;
}