CBRT(3POSIX)

🦋 hey bestie, welcome to cbrt(3POSIX) 🦋

okay so this is cbrt from the POSIX Programmer's Manual, and we're gonna get you fluent in cube roots. it's giving math girlie. periodt. 💅

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✨ PROLOG ✨

okay so first things first, bestie: this manual page is part of the POSIX Programmer's Manual. the Linux implementation of this interface may differ — so if you're on Linux, lowkey go check the corresponding Linux manual page for the deets on Linux behavior. or honestly? the interface might not even be implemented on Linux at all. 🙈 just a heads up so you're not out here confused.

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💖 NAME 💖

cbrt, cbrtf, cbrtl — cube root functions. that's it, that's the whole vibe. three little icons, one job. 🎀

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🌸 SYNOPSIS 🌸

okay so you gotta include the header first, no cap:

#include <math.h>

and then here are your three besties:

double cbrt(double x);
float cbrtf(float x);
long double cbrtl(long double x);

look at them. double, float, long double. precision queens. 👑

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⭐ DESCRIPTION ⭐

so the functionality described on this reference page is aligned with the ISO C standard. if there's any conflict between the requirements described here and the ISO C standard, that conflict is unintentional — it's not that deep, it was an accident, we promise. this volume of POSIX.1‐2017 defers to the ISO C standard. 💜

and what do these functions actually do? they shall compute the real cube root of their argument x. that's the whole plot. main character behavior fr fr. ✨

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🔥 RETURN VALUE 🔥

upon successful completion, these functions shall return the cube root of x. slay. 🌈

but wait, there's more, because edge cases are always the drama:

• If x is NaN, a NaN shall be returned. (nan in, nan out, we don't make the rules 🫶)
• If x is ±0 or ±Inf, x shall be returned. so it just hands you back exactly what you gave it. iconic honestly.

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💀 ERRORS 💀

No errors are defined.

literally nothing. zero. no errors. the following sections are informative, btw — just so you know which parts are the required lore and which parts are the commentary track. 😌

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🎀 EXAMPLES 🎀

None.

we have no examples for you, bestie. the void. the empty set. 🦋

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🌷 APPLICATION USAGE 🌷

None.

same energy. nothing here. moving on. ✨

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🧚 RATIONALE 🧚

okay this part actually eats, so pay attention:

for some applications, a true cube root function — one that returns negative results for negative arguments — is more appropriate than pow(x, 1.0/3.0), which returns a NaN for x less than 0.

like, that's the whole point. cbrt handles your negative inputs like a grown-up. pow(x, 1.0/3.0) does not. it's giving cowardice. 🫣

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👑 FUTURE DIRECTIONS 👑

None.

the future is empty, and honestly? that's fine. no notes. 💅

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💜 SEE ALSO 💜

• The Base Definitions volume of POSIX.1‐2017, <math.h>

that's your one (1) friend in the see-also section. go read about <math.h>, it's where all the math lore lives. 📚

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🌈 COPYRIGHT 🌈

okay so legal moment, but make it cute:

portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group.

and listen: in the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. it's the final boss. the authority. the one who decides. 🏆

the original Standard can be obtained online at http://www.opengroup.org/unix/online.html .

any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source files to man page format. to report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html . (not me being the one who has to tell you that 😭)

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and that's the whole page, bestie!! 🫶 this one came to you courtesy of IEEE/The Open Group, dated 2017, and it lives under the name CBRT(3POSIX). take your cube roots, stay hydrated, and remember: negative inputs deserve love too. bye babes!! 💖✨🎀🦋🌸💅