C :

#include<stdio.h>
int main()
{
 int a[3],i=0,max=0;
 while(scanf("%d%d%d",&a[0],&a[1],&a[2])!=EOF)
 {
   max=0;
   for(i=0;i<3;i++)
   {
    if(max<a[i])
    {
     max=a[i];
    }
   }
   printf("%d\n",max);
 }

 
}

C++ :

#include<iostream>    
#include<stdio.h>  
using namespace std;   
int main()    
{    
int a,b,c;  
while(scanf("%d%d%d",&a,&b,&c)==3)  
{  
if(a>b&&a>c)  
cout<<a<<endl;  
else if(b>=a&&b>=c)  
cout<<b<<endl;  
else if(c>=a&&c>=b)  
cout<<c<<endl;  
}  
return 0;    
}    

Java :

import java.util.Scanner;

public class Main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input = new Scanner(System.in);
		
		int Max = 0;
		int[] a = new int[3];
		for(int i = 0; i < 3; i ++){
			a[i] = input.nextInt();
			if(0 == i){
				Max = a[i];
			}else{
				Max = Max > a[i]? Max:a[i];
			}
		}
		System.out.println(Max);
		input.close();
	}
	
	

}

Python :

# -*- coding: gbk -*-
"""
Created on Wed Dec 30 22:49:43 2015

@author: yl
"""

import math
a = map(lambda x:int(x), raw_input().split())
r = a[0]

print max(a)