Thread: Any ideas why this wont work?

Im trying to run this code...

Code:

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

// Recursive palindrome finder function
bool palindrome(char* word, int length);

int main() {

	char word[100];

	printf("Please enter a word to see if it is a palindrome: ");	// Get word from user
	scanf("%s",&word);

	if((palindrome(word,strlen(word))) == 1) {	// If palindrome returns true, say its a palindorme...
		printf("%s is a palindrome\n",word);
	}
	else {
		printf("%s is not a palindrome\n",word);	// Otherwise, say it isnt
	}

	return 0;
}

// Recursive palindrome finder function
bool palindrome(char* word, int length) {
	int i=0;
	char tempWord[100];
	int length;
	if(strlen(word) == 1) {	// If the word is only 1 letter long, it is a palindrome
		return true;
	}
	else {
		if(word[0] == word[(strlen(word) - 1)]) {	// If first letter equals the last letter...
			for(i = 0; i < strlen(word); i++) {
				tempword[i] = word[(i+1)];	// Cut the first and last letters off the word...
			}
			strcpy(word,tempWord);
			length = strlen(word);
			palindrome(word,length);	// Rerun recursive function
		}
		else {
			return false;
		}
	}
}

...but Im getting these errors:

--------------------Configuration: cc - Win32 Debug--------------------
Compiling...
c.c
C:\Documents and Settings\**********\Desktop\cc\c.c(4) : error C2061: syntax error : identifier 'palindrome'
C:\Documents and Settings\**********\Desktop\cc\c.c(4) : error C2059: syntax error : ';'
C:\Documents and Settings\**********\Desktop\cc\c.c(4) : error C2059: syntax error : 'type'
C:\Documents and Settings\**********\Desktop\cc\c.c(13) : warning C4013: 'palindrome' undefined; assuming extern returning int
C:\Documents and Settings\**********\Desktop\cc\c.c(23) : error C2061: syntax error : identifier 'palindrome'
C:\Documents and Settings\**********\Desktop\cc\c.c(23) : error C2059: syntax error : ';'
C:\Documents and Settings\**********\Desktop\cc\c.c(23) : error C2059: syntax error : 'type'
Error executing cl.exe.

c.obj - 6 error(s), 1 warning(s)

Hmmm, you're right... I like C++ sooo much better than C... argh...

hi,

I just wrote a recursive prgm for checking if the word is palindrome or not. The prgm goes like this -

Code:

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

int palindrome(char *arg1,int arg2)
{
   if(strlen(arg1)/2!=arg2-1)
   {
	   if(arg1[strlen(arg1)-arg2]==arg1[arg2-1]) 
	   {
			palindrome(arg1,arg2-1);
			return(0);
		}
		else
			return(1);
   }
}
             
         

int main()
{
    char check_word[100];
    int length;
    
    printf("Enter the word to check for its palindrome : ");
    scanf("%s",&check_word);
    
    length=strlen(check_word);
    if(palindrome(check_word,length)==0)
    {
        printf("%s is a palindrome word....!\n");
    }
    else
    {
        printf("%s is not a palindrome..........!\n");
    }    
}

It is very simple to understand and implement.

bye
Praveen

Just out of curiosity, why use recursion to test a palindrome?

Code:

for(i = 0; i < strlen(word); i++) {
	tempword[i] = word[(i+1)];	// Cut the first and last letters off the word...
}

I don't think this does what the comment says it does. Your compiler should also give you a warning about a missing return value.