0

Hey is their a standard library that gives false and true values or something or are you suppose to assign them?? Im writing a function that suppose to return true or false. And i also tried replacing the words true and false by !0 (true) and 0 (false) but my program gives me a weird segmentation fault with the replaced words and without. Could someone give me some advice?

Edited by speedy94519: n/a

3
Contributors
5
Replies
7
Views
6 Years
Discussion Span
Last Post by jephthah
0

why would you define TRUE as 0 and FALSE as 1?

TRUE and FALSE are defined, as 1 and 0 respectively, in stdbool.h for C99.

if you're unsure do this:

#ifndef FALSE
#define FALSE (0)
#endif
#ifndef TRUE
#define TRUE (1)
#endif
0

why would you define TRUE as 0 and FALSE as 1?

TRUE and FALSE are defined, as 1 and 0 respectively, in stdbool.h for C99.

if you're unsure do this:

#ifndef FALSE
#define FALSE (0)
#endif
#ifndef TRUE
#define TRUE (1)
#endif

the reason i put that is cause our teacher told us, "to return false (!0) and true (0)" i thought it was a hint to replace the true and false with the paranthesized numbers. Does the code that you gave me have to be in a separate file? or could it be included in the current file im working all my functions in?

0

the reason i put that is cause our teacher told us, "to return false (!0) and true (0)" i thought it was a hint to replace the true and false with the paranthesized numbers. Does the code that you gave me have to be in a separate file? or could it be included in the current file im working all my functions in?

Im sorry I had it written wrong, two times. I meant to say that false (0) and true (!0).

0

>Could someone give me some advice?
Not without seeing any code, no. Your problem appears to be a runtime error more than confusion about true and false.

>TRUE and FALSE are defined, as 1 and 0 respectively, in stdbool.h for C99.
They're both lower case, actually:

#define bool _Bool
#define false 0
#define true 1

However, TRUE and FALSE are rather common macros as well.

0

Im sorry I had it written wrong, two times. I meant to say that false (0) and true (!0).

well, then, as narue said they are lowercase, so define them if they aren't already defined.

#ifndef false
#define false (0)
#define true (!0)
#endif

and use them in code like so if (value == true) { ... or whatever you're doing

.

Edited by jephthah: n/a

This topic has been dead for over six months. Start a new discussion instead.
Have something to contribute to this discussion? Please be thoughtful, detailed and courteous, and be sure to adhere to our posting rules.