CBRT(3P)

💖 CBRT(3P) — the cube root girlies 💖

okay bestie, welcome to the POSIX Programmer's Manual 🎀 this is the cbrt page, and she's here to hand you the cube root of whatever you throw at her. pull up a chair, we're doing math.

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✨ PROLOG ✨

so first things first, a lil disclaimer: this manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

translation: don't come for me if your Linux box does something slightly different, go read the Linux page, mkay? 💅

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🌸 NAME 🌸

cbrt, cbrtf, cbrtl — cube root functions 🧊

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🦋 SYNOPSIS 🦋

#include <math.h>

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

three flavors, one vibe. pick your precision, bestie. ✨

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💜 DESCRIPTION 💜

okay so, the functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1‐2017 defers to the ISO C standard. (no drama, the standard is the standard.)

These functions shall compute the real cube root of their argument x. 🌱 that's it. that's the whole job. she takes x, she gives you the cube root, no notes.

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👑 RETURN VALUE 👑

Upon successful completion, these functions shall return the cube root of x. 🎉

• If x is NaN, a NaN shall be returned. 💀
• If x is ±0 or ±Inf, x shall be returned. 🪞

like, she said "I'm not doing anything weird with those, you get back exactly what you gave me."

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🔥 ERRORS 🔥

No errors are defined. 😌

periodt. she does not fail. she does not miss.

The following sections are informative. (iykyk — that means the rest of this is context, not contract.)

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🍓 EXAMPLES 🍓

None. 🙈

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🌈 APPLICATION USAGE 🌈

None. 💅

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🧚 RATIONALE 🧚

okay so this is the good part, listen up:

For some applications, a true cube root function, which 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.

the way that pow(x, 1.0/3.0) just gives up on negative numbers 😭 meanwhile cbrt is out here returning actual negative results like a main character. that's the whole reason she exists. 🫶

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⭐ FUTURE DIRECTIONS ⭐

None. 🎀

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💫 SEE ALSO 💫

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

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💖 COPYRIGHT 💖

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. 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. 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 .

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and that's the page, bestie!! 💖 this absolute icon of a manpage came to you from IEEE/The Open Group, 2017, and her name is CBRT(3P) 🎀 now go compute some cube roots, you gorgeous nerd. ✨🦋💅