problem with bool function in C

[corel]

Hello.
I'm trying to build a program that will identify (from a text file given to it)
a palindrome.
Now i know that my program does not work and i need to work things around a bit but i keep receiving this strange error about bool function:

error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘isPalindrome’

my program is this (it uses the reverse fnction that i have built to reverse the string and if there is white spaces in that string - it will ignore them to form one big string that i can work with later.)

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

bool isPalindrome(char fname[50]);
char *str_dopel(char *str1);

char *str_dopel(char *str1)
{
   register int i;
   char *str2;
   str2 = malloc(sizeof(str1));
   int ascii_value;
   int length = strlen(str1);
   for (i = strlen(str1)-1; i > -1; i--) {

         ascii_value = (int)str1[i];
         if (ascii_value == 32) {

         }else
         {
           str2[length - i] = str1[i-1];
           }

           }


   return (str2);

  }


bool isPalindrome(char fname[50])
{
 FILE *file;

 file = fopen(fname, "r");
 if (file == NULL) {
 printf("Error: Cannot open file.\n");
 return false;
 }
 else {
 printf("File Opened, checking for palindrome...");
}
char line[BUFSIZ];
char data[20][32];
while (fgets(line, sizeof line, file) != NULL)
{
   if (str_dopel(line) == line)
      printf("%s\n", line);
      return true;
   } else
   {
     printf("not palindrome\n");
return false;
    }

}
int main(void)
{
   char name[50];
   printf("Please enter the path to the file to be checked for palindromes: ");
   scanf("[^\n]", name);
   isPalindrome(name);

  return 0;
  }

[ZuK]

Looks like you're compiling using the c compiler and your compiler doesn't support c99 ( bool is not supported earlier ). if so, use int instead.
if your c compiler does supports c99 you should

#include <stdbool.h>

You could also use the c++ compiler to compile your code.

btw you have to

#include <stdlib.h>

as well ( for malloc ).
Kurt