求大神用c51编写一个单片机小程序

#include
#include "intrins.h"
#include "absacc.h"
#define uchar unsigned char
uchar code ledtab[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40,0xff};//0-9
unsigned char disdat[4]="2018";
sbit key=P3^0;
void ext0() interrupt 0
{
	key++;
	key%=3;
}
void t1isr() interrupt 3	//显示
{
	TH1=0xec;
	TL1=0x78;
	P0=0xff;
	P2=0x01<	P0=~ledtab[disdat[3]];
	scanled++;
	scanled%=4;
}
main()
{
	TMOD=0x10;
	TH1=0xec;
	TL1=0x78;
	TR1=1;
	ET1=1;
	EA=1;
	while(1)
	{
	if(key==0)
		{
		disdat[]="0423";
		while(key==0);
		disdat[]="2018";
		}
	}
}