计数0~9999并带有暂停，清零的功能

计数0~9999并带有暂停，清零的功能

 #include
typedef signed int uint;
typedef signed char uchar;
uchar code guan[10]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};
sbit start=P3^2;
sbit suspend=P3^3;
sbit reset=P3^4;
void init();
void delay(uint k);
void xian(int a, int b, int c,int d);
uint num=0;//进中断的次数
uint s1=0,s2=0,s3=0,s4=0,s=0;
void main()
{
  init();
  while(1)
  {
    if(start==0)
   delay(20);
   {
   if(start==0)
   {
    TR0=!TR0;
  while(!start);
   }
 }
 if(suspend==0)
   delay(20);
   {
   if(suspend==0)
   {
    TR0=!TR0;
  while(!suspend);
   }
 }
 if(reset==0)
   delay(20);
   {
     if(reset==0)
  {  
      s=0;
      while(!reset);           
     }
 }
 
   xian(s4,s3,s2,s1);
   
 }
}

void timer0() interrupt 1
{
  TH0=(65536-50000)/256;
  TL0=(65536-50000)%256;
  num++;
    if(num==20)
   {
 s++;
 num=0;
 
 s1=s%10;
 s2=s%100/10;
 s3=s%1000/100;
 s4=s/1000;
   }
}
void init()
{
  TMOD=0X01;
  TH0=(65536-50000)/256;
  TL0=(65536-50000)%256;
  EA=1;
  ET0=1;
  TR0=0;
  }
void delay(uint k)
{
  uint m,n;
 for(m=120;m>0;m--)
 for(n=k;n>0;n--);
}
void xian(int a, int b, int c,int d)
{
  P1=0Xfe;
  P2=guan[a];
  delay(1);
  
  P1=0Xfd;
  P2=guan[b];
   delay(1); 
  
  P1=0Xfb;
  P2=guan[c];
  delay(1);
  
  P1=0Xf7;
  P2=guan[d];
  delay(1);
 
}