C :

#include<stdio.h>
int main()
{
	int a;
	int b;
	int c;
	scanf("%d %d %d",&a,&b,&c);
	if(a>=b &&a>=c)
	{
		printf("%d\n",a);
	}
	else if(b>=a &&b>=c)
	{
		printf("%d\n",b);
	}
	else if(c>=a &&c>=b)
	{
		printf("%d\n",c);
	}
}

C++ :

#include <iostream>
#include <math.h>
using namespace std;
int  main()
{
	int a,b,c;
	cin>>a>>b>>c;
	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 {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int a=input.nextInt(),b=input.nextInt(),c=input.nextInt();
        int m=Math.max(a,b);
        int n=Math.max(c,m);
        System.out.println(n);
    }
}

Python :

# coding=utf-8
#!/usr/bin/python2
import sys
import re
import math
a,b,c=(int(x) for x in raw_input().split(' '))
 
if a>b:
    if a>c:
        print a
    else:
        print c
else:
    if b>c:
        print b
    else:
        print c

C# :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    internal class Program
    {
        static void Main()
        {
            //int[] days = { 31,28,31,30,31,30,31,31,30,31,30,31};
            /*int n = Convert.ToInt32 (Console.ReadLine());
            string[] a1 = Console.ReadLine().Split();
            double r = Convert.ToDouble(a1[0]);
            double b = Convert.ToDouble(a1[1]);
            double c = Convert.ToDouble(a1[2]);
            float pi = 3.1415926f;
            string S = ((r + b+c) / n).ToString("0.00");
            */
            string[] n = Console.ReadLine().Split(' ');
            int a = Convert.ToInt16(n[0]); int b = Convert.ToInt16(n[1]); int c = Convert.ToInt16(n[2]);
            int max =0;
            if (a >= b && a >= c)
            {
                max=a;
            }
            else if (b >= a && b >= c)
            {
                max = b;
            }
            else { max = c; }
            Console.WriteLine(max);

            Console.ReadKey();

        }
    }
}