完美世界笔试题。反转数字

#include <iostream>
#include <string>
using namespace std;

int main() {
    char str[10000] = {'0'};
    gets_s(str);
    int len = strlen(str);
    int i = 0, j = 0;
    //删除多余空格
    while (j < len) {
        while (j < len && str[j] == ' ') j++;
        while (j < len && str[j] != ' ' ) {
            str[i++] = str[j++];
        }
        if (i < len) str[i++] = ' ';
        else break;
    }
    while(str[--i] == ' ');
    str[++i] = '\0';
    len = i;

    //反转
    i = 0, j = len - 1;
    while (i < j) {
        char temp = str[i];
        str[i++] = str[j];
        str[j--] = temp;
    }

    //数字反转
    i = 0, j = 0;
    while (j < len) {
        while (j < len && str[j] != ' ')j++;
        j--;
        while (i < j) {
            char temp = str[i];
            str[i++] = str[j];
            str[j--] = temp;
        }
        while (i < len && str[i] != ' ')i++; i++;
        while (j < len && str[j] != ' ')j++; j++;
    }
    cout << str << endl;
    system("pause");
    return 0;
}