Structures As Members of a Structure - C Structure

C examples for Structure:Structure Definition

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Description

Structures As Members of a Structure

Demo Code

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>

typedef struct Horse Horse;            // Define Horse as a type name

struct Horse                           // Structure type definition
{
  int age;/*from  w  w  w. j  a  va2  s .  c o  m*/
  int height;
  char name[20];
  char father[20];
  char mother[20];
  Horse *next;                         // Pointer to next Horse structure
};

int main(void){
  Horse *first = NULL;                 // Pointer to first horse
  Horse *current = NULL;               // Pointer to current horse
  Horse *previous = NULL;              // Pointer to previous horse

  char test = '\0';                    // Test value for ending input

  for( ; ; )
  {
    printf("another (Y or N)? ");
    scanf(" %c", &test, sizeof(test));
    if(tolower(test) == 'n')
      break;

    // Allocate memory for a Horse structure
    current = (Horse*) malloc(sizeof(Horse));
    if(first == NULL)                  // If there's no 1st Horse...
      first = current;                 // ...set this as 1st Horse

    if(previous != NULL)               // If there was a previous...
      previous->next = current;        // ...set its next to this one

    printf("Enter the name of the horse: ");
    scanf("%s", current->name, sizeof(current->name));

    printf("How old is %s? ", current->name);
    scanf("%d", &current->age);

    printf("How high is %s ( in hands )? ", current -> name );
    scanf("%d", &current->height);

    printf("Who is %s's father? ", current->name);
    scanf("%s", current->father,sizeof(current->father));

    printf("Who is %s's mother? ", current->name);
    scanf("%s", current->mother, sizeof(current->mother));

    current->next = NULL;             // In case it's the last...
    previous = current;               // ...save its address
  }
  current = first;                    // Start at the beginning
  while (current != NULL)             // As long as we have a valid pointer
  {
    printf("%s is %d years old, %d hands high,",
                       current->name, current->age, current->height);
    printf(" and has %s and %s as parents.\n", current->father,
                                               current->mother);
    previous = current;               // Save the pointer so we can free memory
    current = current->next;          // Get the pointer to the next
    free(previous);                   // Free memory for the old one
    previous = NULL;
  }
  first = NULL;
  return 0;
}

Result


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