//do...while
//计算各个数位之和

#include<iostream>
using namespace std;

void while_1();
void do_while();
void huiwenshu();

int main(){

    int choose;
    cout <<"选择"<<endl;
    cout <<"1.do...while"<<endl;
    cout <<"2.while"<<endl;
    cout <<"3.回文数"<<endl;
    cin >>choose;

    if (choose == 2)
    {
        while_1();
    }else if (choose == 1)
    {
        do_while();
    }else if (choose == 3)
    {
        huiwenshu();
    }else{
        cout <<"输入错误!"<<endl;
    }
}

void do_while(){
    cout <<"已进入do..while"<<endl;
    int CIN,andy;
    int a,b,c;

    do
    {
        cin >>CIN;
        a = CIN / 100;
        b= CIN / 10 % 10;
        c = CIN % 10;

        andy = a+b+c;
        cout <<andy<<endl;
    } while (CIN > 0);
}

void while_1(){
    cout <<"已进入while"<<endl;
    int CIN2,andy,a,b,c;
    
    while (CIN2 > 0)
    {
        cin >>CIN2;
        a = CIN2 / 100;
        b = CIN2 / 10 % 10;
        b = CIN2 % 10;
        andy = a+b+c;
        cout <<andy<<endl;
    }
}

void huiwenshu(){
    while (true)
    {
        int n,ge,number = 0,number2;
        cin >>n;
        number2 = n;
        do
        {
            ge = n%10;
            number = number * 10 + ge;
            n = n / 10;
        } while (n > 0);

        if (number != number2)
        {
            cout <<"NO!"<<endl;
        }else
        {
            cout <<"YES!"<<endl;
        }
    }
}