cs8-1.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)	
{						
uint i,j;			
for(i=0;i<k;i++){			
for(j=0;j<121;j++)		
{;}}						
}						
//================================
void main(void)		
{					
uchar a,b,sum;			
a=55;				
b=200;				
	sum=a+b;		
	while(1)			
	{					
	P0= SEG7[ sum/100];		
	P2=0xfb;			
	delay(1);			
	P0= SEG7[ (sum%100)/10];	
	P2=0xfd;			
	delay(1);			
	P0= SEG7[ sum%10];	
	P2=0xfe;			
	delay(1);			
	}				
}