tree.c
author Markus Bröker <mbroeker@largo.dyndns.tv>
Thu, 16 Apr 2009 12:50:39 +0200
changeset 74 829976007e62
parent 61 4b4c97f179da
child 77 49e0babccb23
permissions -rw-r--r--
getrandom macro fixed the getrandom expanded to the wrong value when dealing with expressions. committer: Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 * test/demos/tree.c
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 * Copyright (C) 2008 Markus Broeker
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#define GETRANDOM(max) (1+(int)((float)(max)*rand()/RAND_MAX+1.0))
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struct T {
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    int data;
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    struct T *next;
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};
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typedef struct T T;
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T *make_list (int elements, int rand_max)
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{
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    int i;
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    T *t, *first = NULL;
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    srand (time (NULL));
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    if ((t = malloc (sizeof (T))) == NULL) {
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        perror ("MALLOC");
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        return first;
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    }
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    t->data = GETRANDOM (rand_max);
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    t->next = NULL;
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    first = t;
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    for (i = 1; i < elements; i++) {
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        if ((t->next = malloc (sizeof (T))) == NULL)
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            break;
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        t->next->data = GETRANDOM (rand_max);
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        t = t->next;
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    }
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    t->next = NULL;
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    return first;
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}
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int main (int argc, char **argv)
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{
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    T *t, *next;
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    if (argc != 3) {
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        printf ("Usage: %s <elements> <rand_max>\n", argv[0]);
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        return EXIT_FAILURE;
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    }
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    t = make_list (atoi (argv[1]), atoi (argv[2]));
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    while (t) {
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        printf ("%d\n", t->data);
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        next = t->next;
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        free (t);
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        t = next;
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    };
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    return EXIT_SUCCESS;
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}