【单片机期中测试】5.LCD1602实现简单计算器

#include<reg52.h>
#include"1602.h"
#include"delay.h"
#define uc unsigned char
uc a=0,b=0,c=0,d=0,h=0,l=0,m=0,flag=0,s;     //a,b:两项；c:+-*/； d：运算结果
void delay(uc c1)
{  uc a1,b1;
  for(;c1>0;c1--)
    for(a1=38;a1>0;a1--)
      for(b1=130;b1>0;b1--);
} 
void main()
{
 LCD_Init();           //初始化液晶
 DelayMs(20);          //延时有助于稳定
 LCD_Clear();          //清屏
    while(1)
  {
    P1=0x0F;
    if(P1!=0x0F)
       {
      P1=0x0F; 
      switch(P1)  // 行判断
      {
        case 0x0E: h=0;break;       
        case 0x0D: h=1;break;       
        case 0x0B: h=2;break;       
        case 0x07: h=3;break;       
      }
    P1=0xF0;       
      switch(P1)   // 列判断
      {
        case 0xE0: l=0;break;       
        case 0xD0: l=1;break;       
        case 0xB0: l=2;break;       
        case 0x70: l=3;break; 
      }     
    m=h*4+l;
    if(m>=0&&m<=9)
    {   
        if(flag==0)
        {
          LCD_Clear();          //清屏
          LCD_Write_Com(0x80) ;
          a=m;
          LCD_Write_Data(a+'0') ;
        }
        else                
        { LCD_Write_Com(0x83) ;
          b=m;
          LCD_Write_Data(b+'0') ;
        }        
    }
    if(m>9&&m<14)
    {
      flag=1;
      c=m;
        LCD_Write_Com(0x82) ;
        switch(m)
        {
        case 10:s=0x2B;break;
        case 11:s=0x2D;break;
        case 12:s=0x2A;break;
          case 13:s=0x2F;break;
        }
        LCD_Write_Data(s) ;
    }
    if(m==15) 
    {
         a=0,b=0,c=0,d=0,flag=0;
       LCD_Write_String(0,0,"                ");
       LCD_Write_String(0,1,"        ");
     }
    if(m==14)
    {    
      switch(c)
      {
        case 10:d=a+b;break;
        case 11:if(a>b) d=a-b; else d=b-a;break;
        case 12:d=a*b;break;
        case 13:d=a/b;break;
      }
      LCD_Write_Com(0xc0) ;
        LCD_Write_Data('=');
      LCD_Write_Data(d/10+'0') ;
      LCD_Write_Data(d%10+'0') ;
        c=0,flag=0;     
    }
    delay(1);
    P1=0xf0;
    while(P1!=0xf0)
    {
      delay(1);
      P1=0xf0;    
    }
    delay(1);
    }
    } 
}