ASINH(3POSIX)

📦 version 2017a, in debian bookworm, debian trixie, ubuntu jammy, ubuntu noble, ubuntu resolute, ubuntu stonking

💖 asinh, asinhf, asinhl — inverse hyperbolic sine functions 💖

okay bestie, welcome to the POSIX Programmer's Manual page for asinh(3POSIX) ✨ we're diving into the inverse hyperbolic sine functions and honestly? it's giving math girlie supremacy 🎀

⚠️ real talk first: this manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (so go check the corresponding Linux manual page for the deets on Linux behavior), or the interface might not be implemented on Linux at all. no cap.

🌸 PROLOG 🌸

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.

✨ NAME ✨

asinh, asinhf, asinhl — inverse hyperbolic sine functions

🦋 SYNOPSIS 🦋

#include <math.h>

double asinh(double x);
float asinhf(float x);
long double asinhl(long double x);

💅 DESCRIPTION 💅

So the functionality described on this reference page is aligned with the ISO C standard. If there's any conflict between what's required here and what the ISO C standard says, that conflict is unintentional — this volume of POSIX.1‐2017 just defers to the ISO C standard, periodt.

These functions shall compute the inverse hyperbolic sine of their argument x. 👑

And here's the vibe check for error handling, bestie: an application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. Then on return — if errno is non-zero, or if fetestexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW) is non-zero — an error has occurred. 😭

🔥 RETURN VALUE 🔥

Upon successful completion, these functions shall return the inverse hyperbolic sine of their argument. slay.

  • If x is NaN, a NaN shall be returned.
  • If x is ±0, or ±Inf, x shall be returned.
  • If x is subnormal, a range error may occur and x should be returned.
  • If x is not returned, asinh(), asinhf(), and asinhl() shall return an implementation-defined value no greater in magnitude than DBL_MIN, FLT_MIN, and LDBL_MIN, respectively.

💀 ERRORS 💀

These functions may fail if:

  • Range Error — the value of x is subnormal.
    • If the integer expression (math_errhandling & MATH_ERRNO) is non-zero, then errno shall be set to [ERANGE]. If the integer expression (math_errhandling & MATH_ERREXCEPT) is non-zero, then the underflow floating-point exception shall be raised.
🫶 heads up: the following sections are informative (aka they're not the normative rules, they're the lil bonus commentary).

🌈 EXAMPLES 🌈

None. (yes really, nothing here, we move 💨)

🧚 APPLICATION USAGE 🧚

On error, the expressions (math_errhandling & MATH_ERRNO) and (math_errhandling & MATH_ERREXCEPT) are independent of each other, but at least one of them must be non-zero. iykyk.

🍓 RATIONALE 🍓

None.

⭐ FUTURE DIRECTIONS ⭐

None.

💜 SEE ALSO 💜

  • feclearexcept()
  • fetestexcept()
  • sinh()

The Base Definitions volume of POSIX.1‐2017, Section 4.20, Treatment of Error Conditions for Mathematical Functions, <math.h>

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 .

and that's the whole page bestie!! 💖✨🎀 this icon of a document came to you from IEEE/The Open Group, 2017, under the POSIX Programmer's Manual — mwah, go compute some inverse hyperbolic sines, ily 🦋💅

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