My linux's gcc compiler not supporting boolean values [duplicate]

Question

I'm trying to make a function with return type as boolean...the syntax of the program seems to be correct but the compiler is giving errors....

The header files I've included are:

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

the function I've created is:

34.bool checknull(struct node* node){
35.    if ( node != NULL )
36.        return TRUE;
37.       
38.    return false;
39.}

and what I'm getting at compile time is

bininsertion.c:34:1: error: unknown type name ‘bool’
bininsertion.c: In function ‘checknull’:
bininsertion.c:36:10: error: ‘TRUE’ undeclared (first use in this function)
bininsertion.c:36:10: note: each undeclared identifier is reported only once for each  function it appears in
bininsertion.c:38:9: error: ‘false’ undeclared (first use in this function)

I've tried "TRUE,false" both in small and capital letters but doesn't seem to work...

Answer 1

You should include <stdbool.h> if you want bool, true and false. Also it's true, not TRUE.

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If you don't want to include stdbool.h you can just use the slightly ugly _Bool.