#include 	"lib.h"


void  wait(unsigned long dly)
{ 
	for(; dly > 0; dly--);
}

int  main(int argc, char **argv)
{
	char str[4];

	int timer;

	if(argc > 1)
		str[0] = argv[1][0];
	else
		str[0] = 'N';
	
	str[1] = '\n';
	str[2] = '\r';
	str[3] = '\0';
	
	while(1){
		write(str);
		sleep(100);	//休眠100*10ms
	}

	return 0; 
}