#include"functions.h"
void setup() 
{
  init_port();
  double_digit_addition();
}

void double_digit_addition()
{ 
  volatile unsigned char nums[12]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00,0x79/*E*/};
  volatile unsigned char i,j=0,flag=0,n_1_d_1 = 0,n_1_d_2 = 0,n_1_d_3 = 0,n_1_d_4 = 0,number_of_numbers = 0;
  volatile long sum = 0,number_1 = 0,number_2 = 0;
  while(1)
  { 
   for(i=0;i<4;i++)
  {
    outl(1<<i);
    if((inb() != 0)&(inb() != 0x08))
    {
      switch(flag)
      {
        case 0: n_1_d_1 = entered_num(i,inb()); flag++; delay1(2); break;
        case 1: n_1_d_2 = entered_num(i,inb()); flag++; delay1(2); break;
        case 2: n_1_d_3 = entered_num(i,inb()); flag++; delay1(2); break;
        case 3: n_1_d_4 = entered_num(i,inb()); flag++; delay1(2); break;
      }
    }
    if((i == 3) & (inb() == 0x08))
    {
      switch(flag)
      {
          case 1: // SINGLE DIGIT NUMBER
          switch(number_of_numbers)
          {
            case 0: number_1 = n_1_d_1; n_1_d_1 = 0; number_of_numbers++; flag = 0; break;
            case 1: number_2 = n_1_d_1; n_1_d_1 = 0; number_of_numbers++; flag = 0; break;
          }
          break;

          case 2: // DOUBLE DIGIT NUMBER
          switch(number_of_numbers)
          {
            case 0: number_1 = ((n_1_d_1)*10)+(n_1_d_2); 
            n_1_d_1 = 0; n_1_d_2 = 0; 
            number_of_numbers++; 
            flag = 0; 
            break;
            case 1: number_2 = ((n_1_d_1)*10)+(n_1_d_2); 
            n_1_d_1 = 0; n_1_d_2 = 0; 
            number_of_numbers++; 
            flag = 0; 
            break;
          }
          break;

          case 3: // TRIPLE DIGIT NUMBER
          switch(number_of_numbers)
          {
            case 0: number_1 = ((n_1_d_1)*100)+((n_1_d_2)*10)+(n_1_d_3); 
            n_1_d_1 = 0; n_1_d_2 = 0; n_1_d_3 = 0; 
            number_of_numbers++; 
            flag = 0; 
            break;
            case 1: number_2 = ((n_1_d_1)*100)+((n_1_d_2)*10)+(n_1_d_3); 
            n_1_d_1 = 0; n_1_d_2 = 0; n_1_d_3 = 0; 
            number_of_numbers++; 
            flag = 0; 
            break;
          }
          break;

          case 4: // FOUR DIGIT NUMBER
          switch(number_of_numbers)
          {
            case 0: number_1 = ((n_1_d_1)*1000)+((n_1_d_2)*100)+((n_1_d_3)*10)+(n_1_d_4); 
            n_1_d_1 = 0; n_1_d_2 = 0; n_1_d_3 = 0; n_1_d_4 = 0; 
            number_of_numbers++; 
            flag = 0; 
            break;
            case 1: number_2 = ((n_1_d_1)*1000)+((n_1_d_2)*100)+((n_1_d_3)*10)+(n_1_d_4); 
            n_1_d_1 = 0; n_1_d_2 = 0; n_1_d_3 = 0; n_1_d_4 = 0; 
            number_of_numbers++; 
            flag = 0; 
            break;
          }
          break;

      }
    }

  if(number_of_numbers == 2)
  {
    sum = number_1 + number_2;

    if((sum >= 0) & (sum < 10))// single digit
    {
      outf(nums[sum]); break;
    }
    if((sum >= 10) & (sum < 100)) // double digit
    {
      outk(nums[(sum/10)%10]); outf(nums[sum%10]);
    }
    if((sum >=100) & (sum < 1000)) // triple digit
    {
      outa(nums[(sum/100)]); outk(nums[(sum/10)%10]); outf(nums[sum%10]); break;
    }
    if((sum>=1000) & (sum <10000)) // four digit
    {
      outc(nums[sum/1000]); outa(nums[(sum/100)%10]); outk(nums[(sum/10)%10]); outf(nums[sum%10]); break;
    }
    if(sum >= 10000)
    {
      outc(nums[11]); outa(nums[11]); outk(nums[11]); outf(nums[11]); break;
    }
  }
  }
}
}




void loop() 
{
  // put your main code here, to run repeatedly:

}