NetNews Offline 2/NetNews Offline Volume 2.iso/news/comp/lang/c-part2/13674

Text File | 1996-08-05 | 1.8 KB | 63 lines

Path: mayne.ugrad.cs.ubc.ca!not-for-mail
From: [e-mail] (Kazimir Kylheku)
Newsgroups: comp.lang.c
Subject: Re: HELP : Assignment with strings and pointers.
Date: 9 Apr 1996 11:34:03 -0700
Organization: Computer Science, University of B.C., Vancouver, B.C., Canada
Message-ID: <[e-mail]>
References: <[e-mail]>
NNTP-Posting-Host: mayne.ugrad.cs.ubc.ca

In article <[e-mail]>,
David  <[e-mail]> wrote:
>
>
>This program is probably idiotic since I am in a (intro to C ) class
>but it does work. I was wondering if anyone had a better idea for this
>type of situation. I could not find an actual function in the
>character handling library for this? does one exist ? i would like to
>make a separate function in the main to handle this task? Is it
>possible?
>
>thanx David
>
>
>  #include <stdio.h>
>  #include <ctype.h>
>
>   /* this program determines if the first word  is the second word
>spelled backwords and have only included 3 characters for
>simplification . inputs have been left out for clarity */


You have to use loops to iterate over the characters of two strings
simultaneously, forward over one and backward over the other. In other words,
generalize the test you have hand-coded for the special case of three character
strings.

First you trivially reject the case when the strings have a different length
(or alternately perform the comparison on the first N characters of both
strings, where N is the lesser of their two lengths).

#include <stdio.h>
#include <string.h>

int reversecmp(const char *s1, const char *s2)

{
    size_t L1 = strlen(s1);
    size_t L2 = strlen(s2);
    size_t i, j;

    if (L1 != L2)
        return 0;

    for (i = 0, j = L2-1; i < L1; i++, j--)
        if (s1[i] != s2[j])
            return 0;

    return 1;
}
--