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?
speedy94519 0 Light Poster
jephthah 1,888 Posting Maven
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 speedy94519 0 Light Poster
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?
speedy94519 0 Light Poster
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).
Narue 5,707 Bad Cop Team Colleague
>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 1However, TRUE and FALSE are rather common macros as well.
jephthah 1,888 Posting Maven
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)
#endifand use them in code like so if (value == true) { ... or whatever you're doing
.
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