1082 Read Number in Chinese (25 分)

好不容易看懂了一道题，却不会做！！！
题解代码越看越有味道，越想与有道理！！！

#include
using namespace std;
#define ll long long
char wei[100][100]= {"Shi","Bai","Qian","Wan","Yi"};
char num[100][100]= {"ling","yi","er","san","si","wu","liu","qi","ba","jiu"};
int main()
{
    char  str[51];
    scanf("%s",str);
    int len=strlen(str);
    int left=0,right=len-1;

    if(str[0]=='-')
    {
        printf("Fu");
        left++;
    }
    while(left+4<=right)
    {
        right-=4;

    }
    while(left0)
            {
                flag=1;
            }
            else
            {
                if(flag==1)
                {
                    printf(" ling");
                    flag=0;
                }
                if(left>0) printf(" ");
                printf("%s",num[str[left]-'0']);
                isPrint=1;
                if(left!=right)
                {
                    printf(" %s",wei[right-left-1]);
                }
            }
            left++;

        }
       if(isPrint==1&&right!=len-1)
       {
           printf(" %s",wei[(len-1-right)/4+2]);
       }
       right+=4;

    }
    return 0;

}