Date: Thu, 29 Feb 1996 18:34:17 -0500 (EST) From: Leo Papandreou <leo@rur.com> To: questions@FreeBSD.org Subject: Re: C question: what is wrong with this code Message-ID: <Pine.BSF.3.91.960229183114.8616B-100000@lisa.rur.com> In-Reply-To: <Pine.BSF.3.91.960229164732.5332A-100000@lisa.rur.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Never mind.
int keycmp(const void *a, const void *b)
{
return strcmp(*((char **)a), *((char **)b));
}
and in main()
...
qsort(table, n, sizeof(char *), keycmp);
...
does the trick.
On Thu, 29 Feb 1996, Leo Papandreou wrote:
>
>
> I am having a problem with elementary C. The following stub
> reproduces the problem exactly. What am I doing wrong?
>
>
> #include <stdlib.h>
> #include <stdio.h>
> #include <string.h>
>
> #define TABLESIZE 10
> #define ITERATIONS 10
>
> main()
> {
>
> int i, j , n;
> char *table[TABLESIZE], buff[1024];
>
> for (i = 0; i < ITERATIONS; i++)
> {
> /*
> * populate the table with some random strings
> */
> n = random() % TABLESIZE + 1;
> for (j = 0; j < n; j++)
> {
> sprintf(buff, "%d", random() % 10000);
> table[j] = strdup(buff);
> }
>
> for (j = 0; j < n; j++)
> printf("%s\t", table[j]);
> printf("\n");
>
> /* so far, so good. Now sort the table */
> qsort(table, n, sizeof(char *), strcmp);
> for (j = 0; j < n; j++)
> printf("%s\t", table[j]);
> printf("\n");
> /* huh!? Doesnt look sorted, does it? */
>
> for (j = 0; j < n; j++)
> free(table[j]);
> }
>
> exit(0);
> }
>
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.3.91.960229183114.8616B-100000>