又来求助力

#include<stdio.h>
#include<string.h>
int main()
{
    char arr[11] = { 0 }, tmp;
    scanf("%s", arr);
    int len = strlen(arr), i,len1,j;
    len1 = len;
    if (arr[0] == '-')
    {
        for (i = 1; i < len1 && (len1 - 1 != i); i++)
        {
            tmp = arr[i];
            arr[i] = arr[len1 - 1];
            arr[len1 - 1] = tmp;
            len1--;
        }
        j = 1;
        while (arr[1] == 48)
        {
            for (i = 2; i < len; i++)
            {
                arr[i - 1] = arr[i];
            }
            arr[i-1] = 0;
            j++;
        }
    }
    else
    {
        for (i = 0; i < len1 && (len1 - 1 != i); i++)
        {
            tmp = arr[i];
            arr[i] = arr[len1 - 1];
            arr[len1 - 1] = tmp;
            len1--;
        }
        j = 0;
        while (arr[0] == 48)
            {
                for (i = 1; i < len; i++)
                {
                    arr[i-1] = arr[i];
                }
                arr[i-1] = 0;
                j++;
            }
    }
    printf("%s", arr);
    return 0;
}

问一下各位大佬为什么 那个#1过不去 本蒟蒻下不了数据 想知道数据是多少