Error when using "bool" type

[abelniel]

Hi all,
When I use "bool" type in my program, gcc pop an error

error: `bool' undeclared (first use in this function)

I have included the following lib:

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

So why do I get that error?
Thanks you all.

[dariophoenix]

If you're working in C, the problem is that bool is not a built-in type, as it is in C++. If you're working in C++... no idea

[dynamicleo]

bool is not premitive type in C and some C++ version

if you want to use bool data type, you define as following:

typedef enum bool { false, true };

and then you can use as following:

bool isEqual(bool, bool);

bool logicValue = true;