palindrom - doesn't work...

[israel1986]

Hi.

i'm trying to make it work, i'm sitting already 3 hours and don't really understand where is the problem.
anybody can help with that please?

#include <string.h>
#include <stdio.h>
#include <ctype.h>
#define MAXLEN 400

int polindrom (char s[]);

int main(void) {
	int type;
	char isPolindrom [MAXLEN] = {'\0'};
	int i;
	printf ("enter your polindrom in one line, up to 400 character \n");

	for (i = 0; i<MAXLEN - 1 && ((type = getchar())!= EOF); i++) {
		if isalpha (type){
				if islower (type)
						type = toupper (type);
				isPolindrom[i] = type;
		}
		else
			i--;
	}
	if (!(isalpha (type)))
		i++;
	isPolindrom[i] = '\0';
	if (polindrom (isPolindrom))
		printf ("your string is polindrom");
	else
		printf ("your string is not polindrom");
}

int polindrom (char s[])
{
	char endCounter;
	char startCounter;
	int polindrom = 1;
	for (endCounter = 0; endCounter !=('\0'); endCounter++) {
	}
	for (startCounter = 0; endCounter >0; startCounter++, endCounter--) {
			if ('s[startCounter]' != 'c[endCounter]')
				polindrom = 0;
	}
	return polindrom;
}

thank you

[anduril462]

Take the quotes off of s[startCounter] and c[endCounter], the latter of which should probably be s[endCounter]. Single quotes define a character literal, like 'Q', where you want the letter Q instead of a variable named Q.

[Subsonics]

Some other problems is endCounter, that is first assigned 0, then immediately compared against != 0. It's never assigned to anything that have anything to do with the string.

Then c[] doesn't seem to appear inside your palindrome function, should probably be s[] in both cases.