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114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
/* Searching and Sorting Example
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Copyright (C) 1991-2016 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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/* Define an array of critters to sort. */
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struct critter
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{
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const char *name;
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const char *species;
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};
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struct critter muppets[] =
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{
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{"Kermit", "frog"},
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{"Piggy", "pig"},
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{"Gonzo", "whatever"},
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{"Fozzie", "bear"},
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{"Sam", "eagle"},
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{"Robin", "frog"},
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{"Animal", "animal"},
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{"Camilla", "chicken"},
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{"Sweetums", "monster"},
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{"Dr. Strangepork", "pig"},
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{"Link Hogthrob", "pig"},
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{"Zoot", "human"},
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{"Dr. Bunsen Honeydew", "human"},
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{"Beaker", "human"},
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{"Swedish Chef", "human"}
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};
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int count = sizeof (muppets) / sizeof (struct critter);
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/* This is the comparison function used for sorting and searching. */
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int
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critter_cmp (const void *v1, const void *v2)
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{
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const struct critter *c1 = v1;
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const struct critter *c2 = v2;
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return strcmp (c1->name, c2->name);
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}
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/* Print information about a critter. */
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void
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print_critter (const struct critter *c)
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{
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printf ("%s, the %s\n", c->name, c->species);
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}
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/*@group*/
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/* Do the lookup into the sorted array. */
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void
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find_critter (const char *name)
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{
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struct critter target, *result;
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target.name = name;
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result = bsearch (&target, muppets, count, sizeof (struct critter),
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critter_cmp);
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if (result)
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print_critter (result);
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else
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printf ("Couldn't find %s.\n", name);
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}
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/*@end group*/
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/* Main program. */
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int
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main (void)
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{
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int i;
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for (i = 0; i < count; i++)
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print_critter (&muppets[i]);
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printf ("\n");
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qsort (muppets, count, sizeof (struct critter), critter_cmp);
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for (i = 0; i < count; i++)
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print_critter (&muppets[i]);
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printf ("\n");
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find_critter ("Kermit");
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find_critter ("Gonzo");
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find_critter ("Janice");
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return 0;
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}
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