/************************************************************************ * * 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 example shows the use of 'typedef' on linked lists. * * This is a "First in First out" (FIFO) list. * * Author: M. J. Leslie * * Date: 11-May-95 * ************************************************************************/ #include <stdlib.h> /* malloc */ /************************************************************************/ /* Declare a structure and give it a * data type name with 'typdef' */ typedef struct x { char name[20]; int age; struct x *next_rec; } linklist; /************************************************************************/ main() { linklist *start_pointer; /* Define pointers to the structure */ linklist *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=(linklist *) malloc (sizeof (linklist)); /* Initalise 'next_pointer' to point * to the same location. */ next_pointer=start_pointer; /* Put some data into the reserved * memory. */ strcpy(next_pointer->name, names[count]); next_pointer->age = ages[count]; /* Loop until all data has been read */ while ( ages[++count] != 0 ) { /* Reserve more memory and point to it */ next_pointer->next_rec=(linklist *) malloc (sizeof (linklist)); next_pointer=next_pointer->next_rec; strcpy(next_pointer->name, names[count]); next_pointer->age = ages[count]; } next_pointer->next_rec=NULL; /*===================================================================* = = = Traverse the linked list and O/P all the data within it. = = = *===================================================================*/ next_pointer=start_pointer; while (next_pointer != NULL) { printf("%s ", next_pointer->name); printf("%d \n", next_pointer->age); next_pointer=next_pointer->next_rec; } } /************************************************************************ * * Program results. * * Martin 32 * John 43 * Alex 29 * ************************************************************************/
file: /Techref/language/ccpp/Cref/EXAMPLES/linklst3.c, 2KB, , updated: 1997/4/21 08:52, local time: 2024/12/4 19:57,
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