#include<stdio.h>
#define COUNT 6
#define BEGIN goto begin

int i = COUNT;

int main()
{

static const void * goto_list[COUNT] = 
{
	&&hello0, &&hello1, &&hello2,
	&&hello3, &&hello4, &&hello5
};	//address-of-label extension

begin:
	while(i)
	{
		i--;
		goto *goto_list[i];
	}
	return 0;
hello0:
	printf("Hello,world!\n");
	BEGIN;
hello1:
	printf("Hello,gcc!\n");
	BEGIN;
hello2:
	printf("Hello,clang!\n");
	BEGIN;
hello3:
	printf("Hello,windows!\n");
	BEGIN;
hello4:
	printf("Hello,java!\n");
	BEGIN;
hello5:
	printf("Hello,linux!\n");
	BEGIN;
}