1002：写出这个数

#include<iostream>
using namespace std;
int main(){
    char op;
    op=getchar();
    int sum=0;
    while(op!='\n'){
        switch(op){
            case '1': sum+=1;break;
            case '2': sum+=2;break;
            case '3': sum+=3;break;
            case '4': sum+=4;break;
            case '5': sum+=5;break;
            case '6': sum+=6;break;
            case '7': sum+=7;break;
            case '8': sum+=8;break;
            case '9': sum+=9;break;
            default : sum+=0;break;
        }
        op=getchar();
    }
    //k存储sum的位数
    int k=-1;
    int sum_num[10];
    do {
        k++;sum_num[k]=sum%10;sum/=10; }while(sum!=0);
    while(k!=-1){
        if(k==0){
       switch(sum_num[k]){
            case 1:cout<<"yi";break;
            case 2:cout<<"er";break;
            case 3:cout<<"san";break;
            case 4:cout<<"si";break;
            case 5:cout<<"wu";break;
            case 6:cout<<"liu";break;
            case 7:cout<<"qi";break;
            case 8:cout<<"ba";break;
            case 9:cout<<"jiu";break;
            default:cout<<"ling";
        }
        k--;break;
        }
        switch(sum_num[k]){
            case 1:cout<<"yi ";break;
            case 2:cout<<"er ";break;
            case 3:cout<<"san ";break;
            case 4:cout<<"si ";break;
            case 5:cout<<"wu ";break;
            case 6:cout<<"liu ";break;
            case 7:cout<<"qi ";break;
            case 8:cout<<"ba ";break;
            case 9:cout<<"jiu ";break;
            default:cout<<"ling ";
        }
        k--;
    }
    return 0;
}