单片机数码管显示0到999c语言程序怎么编

#include<reg51.h>

unsigned char xs_d[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};

unsigned int time=0,s,sz;delay(unsigned int k)
{

unsigned int i,j;

for(i=0;i<k;