单片机设计的带余数的简易计算器

程序设计：

#include

        #include

              #include

          #define uchar unsigned char

              #define uint  unsigned int

sbit BEEP = P3^6;                  //蜂鸣器驱动线

 unsigned char code disp_code[]={

              0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,

              0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0xbf};//数码管显示

uchar  key;    //键盘值

uchar num;      //扫描位数

int temp1=0;   //结果整数部分

uint temp2=0;  //结果余数部分

int m=0;    //

uchar ss[8];   //

uchar flag;       //运算标志位

bit c_flag=0;  //辅助标志位

unsigned char code key_code[]={

              0xee,0xde,0xbe,0x7e,0xed,0xdd,0xbd,0x7d,

              0xeb,0xdb,0xbb,0x7b,0xe7,0xd7,0xb7,0x77 }; //键盘编码

unsigned char code num_code[]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe}; //显示位数

/**********************************************************

  延时子函数

**********************************************************/

void delayms(uint ms)

{

   uchar t;

   while(ms--)

   {

     for(t = 0; t < 120; t++);

   }

}

/**********************************************************

  x*0.14MS 延时子函数

**********************************************************/

void delay0(uchar x)   

{

   uchar i;

   while(x--)

   {

     for (i = 0; i<13; i++);

   }

}

/**********************************************************

  蜂鸣器驱动子函数

**********************************************************/

void beep()

{

  uchar i;

  for (i=0;i<180;i++)

  {

    delay0(5);

    BEEP=!BEEP;       //BEEP取反

  }

   BEEP=1;            //关闭蜂鸣器

   delayms(250);      //延时    

}

/**********************************************************

键盘扫描子函数

**********************************************************/

uchar  keyscan()

{

   uchar  scan1,scan2,keycode,j;

   P1=0xf0;

   scan1=P1;

   if((scan1&0xf0)!=0xf0)           //判键是否按下

   {

     delayms(10);                   //延时30ms

     scan1=P1;

     if((scan1&0xf0)!=0xf0)         //二次判键是否按下

     {

        P1=0x0f;

        scan2=P1;

        keycode=scan1|scan2;         //组合成键编码

        for(j=0;j<=15;j++)

        {

           if(keycode== key_code[j])  //查表得键值

           {

              key=j;

              return(key);

           }

        }

     }

   }

   else  P1=0xff;

   return (16);

}

/***************************************************** 

显示数据子程序

********************************************************/

  void display(int xx,uint yy)

  {  uchar   tt=0;

        uint x1;

        uint y1=yy;

               while(yy!=0)             //显示余数

         {ss[tt]=yy%10;

           yy=yy/10;

           tt++ ;

              num=tt;

         }

         if(y1!=0)                        //显示——

           {ss[tt]=16;

             tt++;

                ss[tt]=16;

             tt++;

                }

     x1=abs(xx);                 //显示整数

           while(x1!=0)

         {ss[tt]=x1%10;

           x1=x1/10;

           tt++ ;

              num=tt;

         }

         if(xx<0)                          //显示符号

        { ss[tt]=16;

             tt++;

              num=tt;}

         for(tt=0;tt

       {

           P0=disp_code[ss[tt]];

         delayms(5);  

               if(P2==num_code[num-1])

               P2=      0x7f;

       else P2=_cror_(P2,1);

       }     

  }

/**********************************************************

  判键是否按下子函数

**********************************************************/

void  keydown()

{       

   uchar tt=0;

   P1=0xf0;

   if((P1&0xf0)!=0xf0)

   {

     keyscan();

         beep();

         if(key>9&&c_flag==0)

   {switch(key)

        {case 10:flag=1;temp1=m;c_flag=1;m=0;break;

         case 11:flag=2;temp1=m;c_flag=1;m=0;break;

         case 12:flag=3;temp1=m;c_flag=1;m=0;break;

         case 13:flag=4;temp1=m;c_flag=1;m=0;break;

         case 14:m=-m;break;

         case 15:break;

          }

    }

       if(key==14&&c_flag==1)

           m=-m;

       if(key<=9)

       {if(m>=0) m=m*10+key;

         if(m<0) m=m*10-key; }

       if(key<=9&&flag==5)

       {

       flag=0;

       c_flag=0;

       temp1=temp2=0;

        } 

        }

         if(key==15)

         {switch(flag)

        {case 1:temp1=temp1+m;break;

         case 2:temp1=temp1-m;break;

         case 3:temp1=temp1*m;break;

         case 4:temp2=abs(temp1)%m;temp1=temp1/m;break;

         default:;

         }

         flag=5;

         m=0;

         }

}

void main()

{

     P0 = 0xc0;

     P2 = 0x7f;            //数码管显示"0"

     P1 = 0xff;

        while(1)

   {

     keydown();

        if(flag==5)

        display(temp1,temp2);

        else display(m,0);

   }

}

实物照片：