#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>

int num_weishu(int num) // 判断数字位数
{
    int n = 0;
    num = abs(num);
    if (num == 0)
    {
        return 1;
    }
    while (num > 0)
    {
        num /= 10;
        n++;
    }
    return n;
}

int main()
{
    int x;
    int a = 0;
    int b = 0;
    int m = 0;
    printf("请输入一个整数：");
    scanf("%d", &x);

    a = num_weishu(x);
    b = (int)(pow(10, a - 1) + 0.1); // pow函数是次方运算的函数名,+0.1是为了避免浮点数误差
    printf("这个数字的位数是%d。\n", a);

    if (a > 9)
    {
        printf("超过最大支持位数！\n");
        return -1;
    }
    else
    {

        if (x < 0) // 处理负号
        {
            printf("-");
        }
        while (b > 0)
        {
            m = x / b;
            switch (m)
            {
            case 0:
                printf("ling ");
                break;
            case 1:
                printf("yi ");
                break;
            case 2:
                printf("er ");
                break;
            case 3:
                printf("san ");
                break;
            case 4:
                printf("si ");
                break;
            case 5:
                printf("wu ");
                break;
            case 6:
                printf("liu ");
                break;
            case 7:
                printf("qi ");
                break;
            case 8:
                printf("ba ");
                break;
            case 9:
                printf("jiu ");
                break;
            default:
                break;
            }
            if (b > 9)
            {
                printf(" ");
            }
            x = x % b;
            b = b / 10;
        }
        printf("\n");
    }

    return 0;
}