cs14-4.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};
uchar code ACT[4]={0xfe,0xfd,0xfb,0xf7};		
/**************************************************/	
void sum(uint *q,uint n)			
{								
uint i,s;							
uint *t;							
t=q;								
for(i=0;i<n;i++)s=s+*(t+i);			
t=q+10;							
*t=s;							
}
/**************************************/
void delay(uint k)				
{								
uint i,j;							
for(i=0;i<k;i++){					
for(j=0;j<121;j++)					
{;}}								
}								
								
/******************************************************/
void main(void)					
{								
uint a[11]={0,1,2,3,4,5,6,7,8,9,0};	
uint *pt,len=10;					
pt=a;							
sum(a,len);
	while(1)
	{				
	P0=SEG7[a[10]/1000];
	P2=ACT[3];
	delay(1);		
	P0=SEG7[(a[10]/100)%10];
	P2=ACT[2];
	delay(1);		
	P0=SEG7[(a[10]/10)%10];			
	P2=ACT[1];
	delay(1);
	P0=SEG7[a[10]%10];				
	P2=ACT[0];
	delay(1);
	}							
}