#include<reg51.h>
#include<absacc.h>
void display(void);
#define da0832 XBYTE[0X7FFF]
#define ad XBYTE[0XB8Ff]
#define uchar unsigned char
uchar code tab[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};
unsigned int i,a,b,c,d=0;
main(){
for(;;){
ad=0;
d=ad;
ad=0;
for(a=0;a<255;a++);
da0832=d;
for(a=0;a<255;a++);
display();}}
void display(){
i=d/0.255;
P3=0XeE;P1=tab[i/1000];
for(a=0;a<255;a++);
b=i%1000;
P3=0XeD;P1=tab[b/100];
for(a=0;a<255;a++);
c=b%100;
P3=0Xfb;P1=tab[c/10];
for(a=0;a<255;a++);
P3=0Xe7;P1=tab[c%10];
for(a=0;a<255;a++);}

这段C语言是什么意思呀？能把每条作用告诉我吗
QQ361023986