C :

#include"stdio.h"
int main()
{
	int a,x;
	scanf("%d",&a);
	x=a%10*100+a/10%10*10+a/100;
	printf("%d",x);
	return 0;
} 

C++ :

#include <iostream>
using namespace std;
int main()
{    
	int x;
	cin>>x;
	cout<<x%10<<x/10%10<<x/100;
	return 0;
}

Java :

import java.util.*;
public class Main {
	public static void main(String[] args) {
		Scanner input=new Scanner(System.in);
		int n=input.nextInt();
			int a=n/100;
			int b=n/10%10;
			int c=n%10;
			System.out.println(c*100+b*10+a);	
		
	}

}