Q446: Kibbles `n' Bits `n' Bits `n' Bits

// Run time: 0.000
#include <stdio.h>
void print(int num);

int main()
{
  int n;
  int a, b;
  char op;

  scanf("%d", &n);
  while (n--)
  {
      scanf("%X %c %X", &a, &op, &b);
      print(a);
      printf(" %c ", op);
      print(b);
      printf(" = ");
      if (op == '+')
          printf("%d\n", a+b);
      else
          printf("%d\n", a-b);

  }
}

void print(int num)
{
  char arr[15];
  int mod;
  int i;

  for ( i = 0; i < 13; i++)
      arr[i] = '0';

  i = 0;
  if (!num)
  {
      printf("%013d", num);
      return;
  }

  while (num)
  {
      mod = num % 16;
      switch (mod)
      {
          case  0: arr[i] = arr[i+1] = arr[i+2] = arr[i+3] = '0';    
                   break;
          case  1: arr[i+3] = arr[i+2] = arr[i+1] = '0', arr[i] = '1';
                   break;
          case  2: arr[i+3] = arr[i+2] = arr[i] = '0', arr[i+1] = '1';
                   break;
          case  3: arr[i+3] = arr[i+2] = '0', arr[i+1] = arr[i] = '1';
                   break;
          case  4: arr[i+3] = arr[i+1] = arr[i] = '0', arr[i+2] = '1';
                   break;
          case  5: arr[i+3] = arr[i+1] = '0', arr[i+2] = arr[i] = '1';
                   break;
          case  6: arr[i+3] = arr[i] = '0', arr[i+2] = arr[i+1] = '1';
                   break;
          case  7: arr[i+3] = '0', arr[i+2] = arr[i+1] = arr[i] = '1';
                   break;
          case  8: arr[i+3] = '1', arr[i+2] = arr[i+1] = arr[i] = '0';
                   break;
          case  9: arr[i+3] = arr[i] = '1', arr[i+2] = arr[i+1] = '0';
                   break;
          case 10: arr[i+3] = arr[i+1] = '1', arr[i+2] = arr[i] = '0';
                   break;
          case 11: arr[i+3] = arr[i+1] = arr[i] = '1', arr[i+2] = '0';
                   break;
          case 12: arr[i+3] = arr[i+2] = '1', arr[i+1] = arr[i] = '0';
                   break;
          case 13: arr[i+3] = arr[i+2] = arr[i] = '1', arr[i+1] = '0';
                   break;
          case 14: arr[i+3] = arr[i+2] = arr[i+1] = '1', arr[i] = '0';
                   break;
          case 15: arr[i+3] = arr[i+2] = arr[i+1] = arr[i] = '1';    
                   break;
      }
      num /= 16;
      i += 4;
  }
  for ( i = 12; i >= 0; i--)
      printf("%c", arr[i]);
}