单片机实训:数码管显示学号后4位。89C51求KEIL码答:include "reg51.h"define uchar unsigned char uchar display_code[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};void delay(void){ uchar i;for(i=250;i>0;i--);} void display(){ P2=0x01;P1=display_code[2];// 显示2,...