cs11-3.c

《手把手教你学单片机的C程序设计》及实验程序

#include <REG51.H>		
#define uchar unsigned char	
#define uint unsigned int	
uchar code SEG7[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
//========================
void delay(uint k)				
{							
uint i,j;						
for(i=0;i<k;i++){				
for(j=0;j<121;j++)				
{;}}						
}						
//=======================
void main(void)			
{						
uint s,sum;				
	for(s=50;s<=100;s=s+2)	
 	{sum=sum+s;}			
//-----------------------------------------
	while(1)				
	{					
	P0=SEG7[sum%10];P2=0xfe;delay(1);
	P0=SEG7[(sum%100)/10];P2=0xfd;delay(1);
	P0=SEG7[(sum/100)%10];P2=0xfb;delay(1);
	P0=SEG7[sum/1000];P2=0xf7;delay(1);
	}					
}