program7_10.c

C语言入门经典一书的所有代码。书上面的所有代码均在此。希望大家喜欢

/* Program 7.10  Understand pointers to your hat size   if you dare */
#include <stdio.h>
#include <stdbool.h>

int main(void)
{
  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};

  char *psize = *size;
  int *pheadsize = headsize;

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

  /* 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 */
  for(int i = 0 ; i < 12 ; i++)
  {
    /* Find head size in the headsize array */
    if(your_head > *(pheadsize+i))
      continue;

    /* If it is the first element and the head size is  */
    /* more than 1/8 smaller then the head is too small */
    /*  for a hat                                       */
    if((i == 0) && (your_head < (*pheadsize)-1))
    {
      printf("\nYou are the proverbial pinhead. No hat for"
                                              "you I'm afraid.\n");
      too_small = true;
      break;                          /* Exit the loop */
    }

    /* If head size is more than 1/8 smaller than the current */
    /* element in headsize array, take the next element down  */
    /* as the head size                                       */
    if( your_head < *(pheadsize+i)-1)
      i--;

    printf("\nYour hat size is %c %c%c%c\n",
                      *(psize + i),         /* First row of size  */
                      *(psize + 1*12 + i),  /* Second row of size */
                      (i==4) ?' ' : '/',
                      *(psize+2*12+i));     /* Third row of size  */
    hat_found=true;
    break;
  }
  if(!hat_found && !too_small)
    printf("\nYou, in technical parlance, are a fathead."
                                   " No hat for you, I'm afraid.\n");
  return 0;
}