three///////

今日学习任务	数码管的显示，计算器的设计
今日任务完成情况	计算器较好的完成，但数字闪烁
今日开发中出现的问题汇总	如何进入与跳出循环，计算器各位的顺序问题
今日未解决问题	无
今日开发收获	学会了利用单片机，键盘，数码管设计计算器
自我评价	遇到一些困难但基本完成任务
其他	无

#include <reg51.h>

int key = 0, num1 = 0, num2 = 0;

//共阴数码管表
unsigned char code table[] = {0x3f, 0x06 ,
0x5b , 0x4f , 0x66 , 0x6d, 0x7d ,
0x07 , 0x7f , 0x6f };

void delay()
{
int x=50, i;

   while (x--)
   {
       for (i = 0; i < 10; i++);
   }
}

void delay2()
{
int x=60, i;

   while (x--)
   {
       for (i = 0; i < 25; i++);
   }
}

void KeyScan()
{
   P1 = 0xf0; //判断哪一列被按下
   if(P1 != 0xf0)
   {
       switch(P1)
       {
           case 0xe0:   key = 0;   break;
           case 0xd0:   key = 1;   break;
           case 0xb0:   key = 2;   break;
           case 0x70:   key = 3;   break;
       }
       P1 = 0x0f;//判断哪一行被按下
       switch(P1)
       {
           case 0x0e:   key += 1;   break;
           case 0x0d:   key += 5;   break;
           case 0x0b:   key += 9;   break;
           case 0x07:   key += 13;   break;
       }
       while (P1 != 0x0f);
   }
}

void display(int n)
{

       P2 = ~(1);
       P0 = table[n / 100000];
       delay();

       P2 = ~(1<<1);
       P0 = table[(n % 100000)/10000];
       delay();

       P2 = ~(1<<2);
       P0 = table[(n % 10000)/1000];
       delay();

       P2 = ~(1<<3);
       P0 = table[(n % 1000)/100];
       delay();

       P2 = ~(1<<4);
       P0 = table[(n % 100)/10];
       delay2();

       P2 = ~(1<<5);
       P0 = table[n % 10];
       delay();
}

int main()
{
   int y, display_flag = 0, display_flag2 = 0;
   while (display_flag ==0)
   {
       key = 0;
       KeyScan(); //检测按键

       switch(key)
       {
           case 1:
           case 2:
           case 3:
           case 4:
           case 5:
           case 6:
           case 7:
           case 8:
           case 9:
               num1 = num1 * 10 + key;
               break;
           case 10:
               num1 = num1 * 10 + 0;
               break;
           case 11: //+
               display_flag = 1;
               break;
           case 12: //-
               display_flag = 2;
               break;
           case 13: //*
               display_flag = 3;
               break;
           case 14: // /
               display_flag = 4;
               break;
       }
           display(num1);
   }

   while (display_flag2 != 5)
   {
       key = 0;
       KeyScan(); //检测按键

       switch(key)
       {
           case 1:
           case 2:
           case 3:
           case 4:
           case 5:
           case 6:
           case 7:
           case 8:
           case 9:
               num2 = num2 * 10 + key;
               break;
           case 10:
               num2 = num2 * 10 + 0;
               break;
           case 15: // =
               display_flag2 = 5;
               break;
       }
           display(num2);
   }

switch(display_flag)
{
case 1 :
y = num1 + num2;
break;

   case 2 :
   y = num1 - num2;
       break;

   case 3 :
   y = num1 * num2;
       break;

   case 4 :
   y = num1 / num2;
   break;
}

   while(1)
   {
   display(y);
   }

return 0;
}

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