Thread: Reverse string and compare

  1. #1
    Registered User
    Join Date
    Sep 2010

    Reverse string and compare


    Having some problems with functions in this one. As ypu can see I'm a tottal beginner. What I'm trying to do here is make a program checking if a word is a palindrome. Using 2 functions, one to check and one to reverse the user input string. My problem is simple, yet to hard for me. I can't seem to get to grips with the use of functions and how to call them.
    The code I've written so far looks like this. Any help or pointers would be very appreciated.

    #include <stdio.h>
    #include <stdbool.h>
    #include <string.h>
    bool palindromeCheck (char str1[], char str2[])
         int i=0;
         bool equal;
         while (str1[i] == str2[i] && str1[i] != '\0' && str2[i] != '\0')
         if (str1[i] == '\0' && str2[i] =='\0')
            equal = true;
             equal = false;
         return equal;
    char strReverse(char str1[], char str2[])
          int i=0, j=0;
          while(str1 != '\0')
          char t = str1[i];
          str1[i++] = str2[j];
          str2[j--] = t;
          return str2[100];
    int main (void)
        bool palindromeCheck (char str1[]);
        char strReverse;
        char str1[100];    
        char str2[100];
        int i;
        bool equal;    
        printf ("Enter word:");
        scanf (" %s", str1);
        strcpy (str1, str2);
        printf ("\n\n");
        if (equal=true)
           printf ("Word is a plaindrome!\n");
            printf ("Word is not a palindrome!\n");
        system ("pause");
        return 0;

  2. #2
    Join Date
    Dec 2007
    if (equal=true)
    That *assigns* the value true to equal, it does not *compare* the two.

  3. #3
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    You also need to call your "reverse" and "check" functions as well.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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