C :

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a,b,c;
    scanf("%d%d%d",&a,&b,&c);
    if(a>=b)
    {
        if(a>=c)
            printf("%d",a);
        else
            printf("%d",c);
    }
    if(b>a)
    {
        if(b>=c)
            printf("%d",b);
        else
            printf("%d",c);
    }

}

C++ :

#include<cstdio>
int main(){
	int a,b,c;
	scanf("%d%d%d",&a,&b,&c);
	a = a > b ? a : b;
	a = a > c ? a : c;
	printf("%d\n",a);
	return 0;
}

Pascal :

var
  a,b,c,max:longint;
begin
  readln(a,b,c);
  max:=-maxlongint;
  if (a>max) then max:=a;
  if (b>max) then max:=b;
  if (c>max) then max:=c;
  writeln(max);
end.

Java :

import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner in=new Scanner(System.in);
        int a=in.nextInt();
        int b=in.nextInt();
        int c=in.nextInt();
        int Max=0;
        if(a>b){
            if(a>c){
                System.out.println(a);
            }
            else{
                System.out.println(c);
            }
        }
        else{
            if(b>c){
                System.out.println(b);
            }
            else
                System.out.println(c);
        }
    }
}