#3 Leetcode (Reverse Integer)
#include<iostream>
using namespace std;
#include<math.h>
int main(){
// Reverse Integer
int x;
cout<<"input: ";
cin>>x;
int digit, ans = 0;
while(x!=0){
digit = x%10;
ans = (ans*10) + digit;
x = x/10;
}
if ((ans)>=INT_MAX/10 || (ans)<=INT_MIN/10){
cout<<0;
}
else{
cout<<ans;
}
}