电子时钟废话不说，要就看 不要就免

#include<reg51.h>
sfr d_p=0x80;
sfr w_p=0xA0;
char code seg[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
signed int h=12,m=0,s=0,c_50ms=0,flash=0,h_sp=12;m_sp=1;
bit f_ss=0;
bit f_mm=0;
bit f_hh=0;
sbit key1=P3^0;
sbit key2=P3^1;
sbit key3=P3^2;
sbit speake=P3^5;
bit f_k1=1;
bit f_k2=1;
bit f_k3=1;
bit f_s=1;
bit f_tr0=1;
bit f_sp=0;
char cout=0;
int x=0;
void display(void);
void delay(int i);
char key1_scan(void);
char key2_scan(void);
char key3_scan(void);

void key_scan(void)
{
switch(cout)
{
case 0:f_hh=0;f_mm=0;f_ss=0;
 if(key1_scan()) {cout=1;f_tr0=0;}
 break;
case 1:f_hh=1;f_mm=0;f_ss=0;
 if(key1_scan()) cout=2;
 if(key2_scan()){h++;if(h>23)h=0;}
 if(key3_scan()){h--;if(h==-1)h=23;}
 break;
case 2:f_hh=0;f_mm=1;f_ss=0;
 if(key1_scan()) cout=3;
 if(key2_scan()){m++;if(m==60)m=0;}
 if(key3_scan()){m--;if(m==-1)m=59;}
 break;
case 3:f_hh=0;f_mm=0;f_ss=1;
 if(key1_scan()) cout=0;
 if(key2_scan()){s++;if(s==60)s=0;}
 if(key3_scan()){s--;if(s==-1)s=59;}
 break;
default:break;
}
}


void clock(void)
{