题解 | 反向输出一个四位数

#include<iostream>
#include<cmath>
using namespace std;
int main(){
	int n;
	cin>>n;
	int a,b,c,d,e,f;
	a = n/1000;
	b = n%1000;
	c = b/100;
	d = b%100;
	e = d/10;
	f = d%10;
	cout<<f<<e<<c<<a;
	return 0;
}