Simple calculator source code

#include
#define uint unsigned int
#define uchar unsigned char
uchar code tab[]={0xee,0xed,0xeb,0xe7,
      0xde,0xdd,0xdb,0xd7,
      0xbe,0xbd,0xbb,0xb7,
      0x7e,0x7d,0x7b,0x77,}; //0~f key position code table


uchar code tab1[]={0x88,0Xbe,0Xc4,0X94,0Xb2,0X91,0X81,0Xbc,
       0X80,0X90,0xa0,0x83,0xc9,0x86,0xc1,0xe1,0xff}; //0~f font code table

void delay(uchar x) //millisecond delay function
{
 flying y;           
 for(;x>0;x--)
  for(y=110;y>0;y--);
}


scanf() //Key processing function   
{
 fly temp,temp1,i;  
 P0=0xf0; //Assign the value of P0 to oxf0 for column scanning
 if(P0!=0xf0) //Determine if a key is pressed
 {
  delay(2); 
  if(P0!=0xf0) //Check again whether a key is pressed
  {
   temp1=P0; //P0 value is assigned to temp1
   P0=0x0f; //P0 value is assigned to 0x0f for row scanning
   temp=temp1|P0; //Merge the row and column scan values ​​and assign them to temp
  }
 
 switch(temp)
 {
  case 0xee:i=1; break;
  case 0xed:i=2; break;
  case 0xeb:i=3; break;
  case 0xe7:i=4; break;
  case 0xde:i=5; break;
  case 0xdd:i=6; break;
  case 0xdb:i=7; break;
  case 0xd7:i=8; break;
  case 0xbe:i=9; break;
  case 0xbd:i=0; break;
  case 0xbb:i=10; break;
  case 0xb7:i=11; break;
  case 0x7e:i=12; break;
  case 0x7d:i=13; break;
  case 0x7b:i=14; break;
  case 0x77:i=15; break; 
 }
 }
  else return 16;
  return i;
}  

 

void display(uint temp) //display function
{
 flying i;
 float z[6];
 from[0]=16;
 z[1]=temp/10000;
 z[2]=temp%10000/1000;
 z[3]=temp%1000/100;
 z[4]=temp%100/10;
 z[5]=temp%10;


 for(i=0;i<6;i++)
 {  
  SBUF=tab1[z[i]]; // Find the key code value according to the key value and assign the key code value to the serial port send register
  while(!TI); //Judge whether the serial port data transmission is completed
  TI=0; //Serial port data transmission completed flag cleared to 0
 }


}

 

E(uchar n)
{
 uint  t=1;
 for(;n>0;n--)
 t=t*10;
 return t; 
}

 

 

void main(void) //main function
{ 

 


 uint has,has1;

 fly x,y,fh,j,k=0;
 flying zhi[6];
 fly zhi1[6];

while(1)
 {


  if(x<5&&!k)
  { if(scanf()<10)
  {
   delay(5);
   if(scanf()<10)
   {
     if(x==0){zhi[0]=scanf();while(scanf()!=16);}
    
     if(x==1){zhi[1]=scanf();while(scanf()!=16);}

     if(x==2){zhi[2]=scanf();while(scanf()!=16);}

     if(x==3){zhi[3]=scanf();while(scanf()!=16);}

     if(x==4){zhi[4]=scanf();while(scanf()!=16);}   


     x++;           
     has=0;

    for(y=0;y11&&scanf()<16)
 {
  delay(2);
  if(scanf()>9&&scanf()<16)
  {
   
   fh=scanf();
   while(scanf()!=16);
   k=1;
  }
 }


  

if(j<5&&k)
  { if(scanf()<10)
  {
   delay(2);
   if(scanf()<10)
   {
     if(j==0){zhi1[0]=scanf();while(scanf()!=16);}
    
     if(j==1){zhi1[1]=scanf();while(scanf()!=16);}

     if(j==2){zhi1[2]=scanf();while(scanf()!=16);}

     if(j==3){zhi1[3]=scanf();while(scanf()!=16);}

     if(j==4){zhi1[4]=scanf();while(scanf()!=16);}

     j++;           
     tem1=0;

    for(y=0;y