C :

#include <stdio.h>
int main(){
    int n, a, b, c, f;
    while(scanf("%d", &n) && n != 0){
        a = n%10;
        b = n/10%10;
        c = n/100;
        if(a*a*a + b*b*b + c*c*c == n)
            puts("Yes");
        else
            puts("No");
    }

    return 0;
}

C++ :

#include <iostream>

using namespace std;

int main()
{
    int n,a,b,c;
    while(cin>>n&&n){
        a=n%10;
        b=n/10%10;
        c=n/100%10;
		if(n!=0)
          if(a*a*a+b*b*b+c*c*c==n){
            cout<<"Yes"<<endl;
        }else{
            cout<<"No"<<endl;
        }
		else break;
    }
    return 0;
} 

Java :

import java.util.Scanner;
public class Main
{
	public static void main(String[] args)
	{
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext())
		{
			int n=sc.nextInt();
			if(n==0)
				break;
			String str=Integer.toString(n);
			int a=(int)Math.pow((str.charAt(0)-'0'),3);
			int b=(int)Math.pow((str.charAt(1)-'0'),3);
			int c=(int)Math.pow((str.charAt(2)-'0'),3);
			if(a+b+c==n)
				System.out.println("Yes");
			else
				System.out.println("No");
		}
	}
}