cs9-1.c

《手把手教你学单片机的C程序设计》及实验程序

#include <REG51.H>	
#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);			
//==============================
void main(void)			
{					
uchar a,b,c,out;	
	a=100;				
	b=60;				
	c=9;				
	out=a+3*(b-c)/2;		
	while(1)			
	{				
	P0= SEG7[ out/100];	
	P2=0xfb;				
	delay(1);				
	P0= SEG7[ (out%100)/10];	
	P2=0xfd;			
	delay(1);			
	P0= SEG7[ out%10];	
	P2=0xfe;				
	delay(1);				
	}				
}					
//========================
void delay(uint k)		
{						
uint i,j;					
for(i=0;i<k;i++){		
for(j=0;j<121;j++)		
{;}}					
}