八路抢答器at89c51

#include<reg51.h> sbit fw=P2^0; void delay(unsigned int i) { unsigned int k; for(k=0;k<i;k++); } void main() { unsigned char button,n; unsigned char code disp[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0xbf}; P1=disp[8]; while(1) { if(fw==0) {while(fw==0); P1=0xff; n=1; } if(n==1) { button=P0; delay(1200); button=P0; switch(button) { case 0xfe:P1=disp[0];delay(10000);while(1){if(fw==0) P1=0XFF;n=0;break;}break; case 0xfd:P1=disp[1];delay(10000);while(1){if(fw==0)P1=0XFF;n=0;break;}break; case 0xfb:P1=disp[2];delay(10000);while(1){if(fw==0)P1=0XFF;n=0;break;}break; case 0xf7:P1=disp[3];delay(10000);while(1){if(fw==0)P1=0XFF;n=0;break;};break; case 0xef:P1=disp[4];delay(10000);while(1){if(fw==0)P1=0XFF;n=0;break;}break; case 0xdf:P1=disp[5];delay(10000);while(1){if(fw==0)P1=0XFF;n=0;break;}break; case 0xbf:P1=disp[6];delay(10000);while(1){if(fw==0)P1=0XFF;n=0;break;}break; case 0x7f:P1=disp[7];delay(10000);while(1){if(fw==0)P1=0XFF;n=0;break;}break; } } } }