program2_18.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 2.18  Calculating the height of a tree */
#include <stdio.h>

int main(void)
{
  long shorty = 0L;                   /* Shorty's height in inches                 */
  long lofty = 0L;                    /* Lofty's height in inches                  */
  long feet = 0L;
  long inches = 0L;
  long shorty_to_lofty = 0L;          /* Distance from Shorty to Lofty in inches   */
  long lofty_to_tree = 0L;            /* Distance from Lofty to the tree in inches */
  long tree_height = 0L;              /* Height of the tree in inches              */
  const long inches_per_foot = 12L;

  /* Get Lofty's height */
  printf("Enter Lofty's height to the top of his/her head, in whole feet: ");
  scanf("%ld", &feet);
  printf("                                          ... and then inches: ");
  scanf("%ld", &inches);
  lofty = feet*inches_per_foot + inches;

  /* Get Shorty's height up to his/her eyes */
  printf("Enter Shorty's height up to his/her eyes, in whole feet: ");
  scanf("%ld", &feet);
  printf("                                   ... and then inches: ");
  scanf("%ld", &inches);
  shorty = feet*inches_per_foot + inches;

  /* Get the distance from Shorty to Lofty */
  printf("Enter the distance between Shorty and Lofty, in whole feet: ");
  scanf("%ld", &feet);
  printf("                                       ... and then inches: ");
  scanf("%ld", &inches);
  shorty_to_lofty = feet*inches_per_foot + inches;

  /* Get the distance from Lofty to the tree */
  printf("Finally enter the distance to the tree to the nearest foot: ");
  scanf("%ld", &feet);
  lofty_to_tree = feet*inches_per_foot;

  /* Calculate the height of the tree in inches */
  tree_height = shorty + (shorty_to_lofty + lofty_to_tree)*(lofty-shorty)/
                                                                 shorty_to_lofty;

  /* Display the result in feet and inches               */
  printf("The height of the tree is %ld feet and %ld inches.\n",
                      tree_height/inches_per_foot, tree_height% inches_per_foot);
return 0;
}