C :

#include <stdio.h>

int main(void) {
	int a, b;
	scanf("%d%d", &a, &b);
	if(a > b)
		printf("%d", a*a);
	else
		printf("%d", b*b);
	return 0;
}

C++ :

#include<cstdio>
using namespace std;
int main()
{
	int x1,x2;
	scanf("%d%d",&x1,&x2);
	if(x1>x2)
	{
		printf("%d\n",x1*x1);
	}
	else
	{
		printf("%d\n",x2*x2);
	}
	return 0;
}

Pascal :

program y1;
 var
  a,b:integer;
 begin
  readln(a,b);
  if a>b then writeln(a*a)
           else writeln(b*b);
 end.