c语言对数字判断问题

Question

打了好久都没有思路，各位帮忙看看这个
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Answer 1

 
#include <stdio.h>
int main()
{
    int x, count;
    count = 1;
    scanf("%d", &x);
    int n = x;
    int i = 0;
    int number[10] = {0};
    while (x / 10 > 0)
    {
        number[i++] = x % 10;
        x = x / 10;
        if (x >= 0)
        {
            count++;
        }
    }
    number[i++] = x % 10;
    printf("%d\n", count);
 
    for (i = count - 1; i >= 0; i--)
    {
        printf("%d", number[i]);
        if(i != 0)
        {
            printf(" ");
        }
    }
    printf("\n");
    for (i = 0; i < count; i++)
    {
        printf("%d", number[i]);
    }
    printf("\n");
    return 0;
}