SDUT OJ逆置正整数

 SDUT OnlineJudge

#include<iostream>
using namespace std;
int main()
{
int a,b,c,d;
cin>>a;
b=a%10;
c=a/10%10;
d=a/100%10;
int key[3];
key[0]=b;
key[1]=c;
key[2]=d;
for(int i = 0;i<3;i++)
{if(key[i]!=0){cout<<key[i];}
}return 0;
}