program5_06.c

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/* Program 5.6 Know your hat size - if you dare...  */
#include <stdio.h>
#include <stdbool.h>

int main(void)

{
   /* The size array stores hat sizes from 6 1/2 to 7 7/8 */
   /* Each row defines one character of a size value so   */
   /* a size is selected by using the same index for each */
   /* the three rows. e.g. Index 2 selects 6 3/4.         */
   char size[3][12] = {                /* Hat sizes as characters */
      {'6', '6', '6', '6', '7', '7', '7', '7', '7', '7', '7', '7'},
      {'1', '5', '3', '7', ' ', '1', '1', '3', '1', '5', '3', '7'},
      {'2', '8', '4', '8', ' ', '8', '4', '8', '2', '8', '4', '8'}
                      };

  int headsize[12] =                  /* Values in 1/8 inches    */
      {164,166,169,172,175,178,181,184,188,191,194,197};

  float cranium = 0.0;                 /* Head circumference in decimal inches */
  int your_head = 0;                   /* Headsize in whole eighths            */
  int i = 0;                           /* Loop counter                         */
  bool hat_found = false;              /* Indicates when a hat is found to fit */

  /* Get the circumference of the head */
  printf("\nEnter the circumference of your head above your eyebrows "
       "in inches as a decimal value: ");
  scanf(" %f", &cranium);

  /* Convert to whole eighths of an inch */
  your_head = (int)(8.0*cranium);

  /* Search for a hat size */
	/* A fit is when your_head is greater that one headsize element */
	/* and less than or equal to the next. The size the the second  */
	/* headsize value.                                              */
  for (i = 1 ; i < 12 ; i++)

    /* Find head size in the headsize array */
    if(your_head > headsize[i-1] && your_head <= headsize[i])
    {
      hat_found = true;
       break;
    }

  if(your_head == headsize[0])  /* Check for min size fit    */
  {
    i = 0;
    hat_found = true;
  }

  if(hat_found)
    printf("\nYour hat size is %c %c%c%c\n",
              size[0][i], size[1][i], (size[1][i]==' ') ? ' ' : '/', size[2][i]);
  /* If no hat was found, the head is too small, or too large    */
  else
  {
    if(your_head < headsize[0])         /* check for too small   */
      printf("\nYou are the proverbial pinhead. No hat for"
                                                 " you I'm afraid.\n");
    else                                /* It must be too large  */
      printf("\nYou, in technical parlance, are a fathead."
                                  " No hat for you, I'm afraid.\n");
  }

  return 0;
}