If you have a compiler that supports C99 you can
#include <stdbool.h>
Otherwise, you can define your own if you'd like. Depending on how you want to use it (and whether you want to be able to compile your code as C++), your implementation could be as simple as:
#define bool int
#define true 1
#define false 0
In my opinion, though, you may as well just use int and use zero to mean false and nonzero to mean true. That's how it's usually done in C.
C99 has a boolean datatype, actually, but if you must use older versions, just define a type:
typedef enum {false=0, true=1} bool;
C99 has a bool type. To use it,
#include <stdbool.h>
C99 introduced _Bool as intrinsic pure boolean type. No #includes needed:
int main(void)
{
_Bool b = 1;
b = 0;
}
On a true C99 (or higher) compliant C compiler the above code should compile perfectly fine.
As an alternative to James McNellis answer, I always try to use enumeration for the bool type instead of macros: typedef enum bool {false=0; true=1;} bool;. It is safer b/c it lets the compiler do type checking and eliminates macro expansion races
struct Bool {
int true;
int false;
}
int main() {
/* bool is a variable of data type – bool*/
struct Bool bool;
/*below I’m accessing struct members through variable –bool*/
bool = {1,0};
print("Student Name is: %s", bool.true);
return 0;
}
We can use enum type for this.We don't require a library. For example
enum {false,true};
the value for false will be 0 and the value for true will be 1.
Source: Stackoverflow.com