这是下面程序（三数字个叠在一起了）

#include <reg51.h>
#include <intrins.h>

#define uchar unsigned char
#define uint unsigned int

typedef unsigned char u8;
typedef unsigned int u16;

u8 code smgduan[] = {0x08,0x0C,0x08,0x08,
0x08,0x08,0x08,0x7F,
                   0x38,0x24,0x22,0x10,
                   0x08,0x04,0x3E,0x00,
                   0x38,0x24,0x10,0x08,
                   0x10,0x24,0x38,0x00};

void delay(u16 a)
{
while(a--);
}

u8 i;

void DigDisplay()
{
   for(i = 0;i < 8;i++)
   {
       switch(i)
       {
           case(0):
               P0 = 0xFE;break;
           case(1):
               P0 = 0xFD;break;
           case(2):
               P0 = 0xFB;break;
           case(3):
               P0 = 0xF7;break;
           case(4):
               P0 = 0xEF;break;
           case(5):
               P0 = 0xDF;break;
           case(6):
               P0 = 0xBF;break;
           case(7):
               P0 = 0x7F;break;
           }
           P2 = smgduan[i];
           delay(100);
       }
}

void DigDisplay2()
{
   u8 b;
   for(b = 0;b < 8;b++)
   {
       switch(b)
       {
           case(0):
               P0 = 0xFE;break;
           case(1):
               P0 = 0xFD;break;
           case(2):
               P0 = 0xFB;break;
           case(3):
               P0 = 0xF7;break;
           case(4):
               P0 = 0xEF;break;
           case(5):
               P0 = 0xDF;break;
           case(6):
               P0 = 0xBF;break;
           case(7):
               P0 = 0x7F;break;
           }
           P2 = smgduan[b + 8];
           delay(100);
       }
}

void DigDisplay3()
{
   u8 c;
   for(c = 0;c < 8;c++)
   {
       switch(c)
       {
           case(0):
               P0 = 0xFE;break;
           case(1):
               P0 = 0xFD;break;
           case(2):
               P0 = 0xFB;break;
           case(3):
               P0 = 0xF7;break;
           case(4):
               P0 = 0xEF;break;
           case(5):
               P0 = 0xDF;break;
           case(6):
               P0 = 0xBF;break;
           case(7):
               P0 = 0x7F;break;
           }
           P2 = smgduan[c + 16];
           delay(100);
       }
}
void main()
{
   while(1)
   {
       DigDisplay();
       DigDisplay2();
       DigDisplay3();
   }
}

Happy_dog Jack

tcp/ip详解源代码在ubuntu14.04下编译出错

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