这是一个用按键调节七段显示屏显示数字的值的程序，其中一个按键按下加1，另外一个按下减1
程序：
#include#include sbit P2_2=P2^2 ;sbit P2_3=P2^3 ;sbit P3_3=P3^3;sbit P3_4=P3^4;unsigned char num=18,shi,fen;unsigned char table[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};void delay(unsigned char dly){ unsigned char i,j; for(i=255;i>0;i--) for(j=dly;j>0;j--);} void initial(){ TMOD=0x01; EA=1; TR0=1; ET0=1;}void timer0() interrupt 1{ TH0=(65535-10000)/256; TL0=(65535-10000)% 256; shi=num/10; fen=num; P2_2=1; P2_3=0; P0=table[shi]; delay(2); P2_2=0; P2_3=1; P0=table[fen]; delay(2); }void main(){ initial(); while(1) { if(P3_3==0) { num++; while(P3_3==0);} if(P3_4==0) { num--; while(P3_4==0);}}}