/************************************************************************
*
* Purpose: To demonstrate 'linked lists' This program will build a
* linked list and place data into it. When the data is exausted
* the contents of the list are O/P.
*
* This is a "First in First out" (FIFO) list.
*
* Author: M. J. Leslie
*
* Date: 11-May-95
*
************************************************************************/
#include <stdlib.h> /* malloc */
/************************************************************************/
struct x { /* Declare a structure */
char name[20];
int age;
struct x *next_rec;
};
/************************************************************************/
main()
{
struct x *start_pointer; /* Define pointers to the structure */
struct x *next_pointer;
/* Create some data to be placed in the
* Linked list. */
char *names[]=
{
"Martin",
"John ",
"Alex ",
""
};
int ages[]={32, 43, 29, 0};
int count=0; /* General purpose counter. */
/*===================================================================*
= =
= Build a LINKED LIST and place data into it. =
= =
*===================================================================*/
/* Initalise 'start_pointer' by reserving
* memory and pointing to it */
start_pointer=(struct x *) malloc (sizeof (struct x));
/* Initalise 'next_pointer' to point
* to the same location. */
next_pointer=start_pointer;
/*********************************************************************
*
* start_pointer ---
* |
* |
* V
* -----------------
* | | | |
* -----------------
* A
* |
* |
* next_pointer ---
*
*********************************************************************/
/* Put some data into the reserved
* memory. */
strcpy(next_pointer->name, names[count]);
next_pointer->age = ages[count];
/*********************************************************************
*
* start_pointer ---
* |
* |
* V
* -----------------
* |Martin | 32 | |
* -----------------
* A
* |
* |
* next_pointer ---
*
*********************************************************************/
/* Loop until all data has been read */
while ( ages[++count] != 0 )
{
/* Reserve more memory and point to it */
next_pointer->next_rec=(struct x *) malloc (sizeof (struct x));
/******************************************************************
*
* start_pointer ---
* |
* |
* V
* -----------------
* |Martin | 32 | | |
* ---------------|-
* A |
* | V
* | ---------------
* next_pointer --- | |
* ---------------
*
******************************************************************/
next_pointer=next_pointer->next_rec;
/******************************************************************
*
* start_pointer ---
* |
* |
* V
* -----------------
* |Martin | 32 | | |
* ---------------|-
* |
* V
* ---------------
* next_pointer --------------->| |
* ---------------
*
******************************************************************/
strcpy(next_pointer->name, names[count]);
next_pointer->age = ages[count];
/******************************************************************
*
* start_pointer ---
* |
* |
* V
* -----------------
* |Martin | 32 | | |
* ---------------|-
* |
* V
* ----------------
* next_pointer --------------->|John | 43 | |
* ----------------
*
******************************************************************/
}
next_pointer->next_rec=NULL;
/*===================================================================*
= =
= Traverse the linked list and O/P all the data within it. =
= =
*===================================================================*/
next_pointer=start_pointer;
/******************************************************************
*
* start_pointer ---
* |
* |
* V
* -----------------
* |Martin | 32 | | |
* ---------------|-
* A |
* | V
* | ----------------
* next_pointer --- |John | 43 | |
* ----------------
*
******************************************************************/
while (next_pointer != NULL)
{
printf("%s ", next_pointer->name);
printf("%d \n", next_pointer->age);
next_pointer=next_pointer->next_rec;
/******************************************************************
*
* start_pointer ---
* |
* |
* V
* -----------------
* |Martin | 32 | | |
* ---------------|-
* |
* V
* ----------------
* next_pointer --------------->|John | 43 | |
* ----------------
*
******************************************************************/
}
}
/************************************************************************
*
* Program results.
*
* Martin 32
* John 43
* Alex 29
*
************************************************************************/
| file: /Techref/language/ccpp/cref/EXAMPLES/linklst1.c, 6KB, , updated: 1997/4/21 09:52, local time: 2024/4/18 15:17,
18.223.32.230:LOG IN
|
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