cs7-1.c

《手把手教你学单片机的C程序设计》及实验程序

#include <REG51.H>		
unsigned char code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
#define CONST 2		
/*===================================*/
void delay(unsigned int k)	
{				
unsigned int i,j;		
for(i=0;i<k;i++){		
for(j=0;j<121;j++)		
{;}}					
}					
//===============================
void main(void)		
{				
unsigned char x=1,y,i;	
	while(1)				
	{					
	y=x*CONST;			
	  for(i=0;i<250;i++)	
	  {				
	   P0= SEG7[y%10];	
	   P2=0xfe;		
	   delay(1);		
	   P0= SEG7[y/10];	
	   P2=0xfd;		
	   delay(1);		
	  }				
	if(x<25)x=x+1;		
	}				
}