COSH(3POSIX)

💖 COSH(3POSIX) — the POSIX Programmer's Manual, bestie edition 💖

okay so before we even get into it — this page is literally part of the POSIX Programmer's Manual. the Linux implementation of this interface might be different (so like, go read the corresponding Linux manual page for the deets on Linux behavior), or honestly? the interface might not even be implemented on Linux at all. 🙈

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✨ 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.

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🌸 NAME 🌸

cosh, coshf, coshl — hyperbolic cosine functions. that's the whole vibe, three names, one job 💅

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🎀 SYNOPSIS 🎀

#include <math.h>

double cosh(double x);
float coshf(float x);
long double coshl(long double x);

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🦋 DESCRIPTION 🦋

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. (so like, ISO C is the main character here, we're just supporting cast 🫶)

These functions shall compute the hyperbolic cosine of their argument x.

okay so here's the part where you actually check for errors — if your application wants to check for error situations, you 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. periodt. 🔥

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💅 RETURN VALUE 💅

Upon successful completion, these functions shall return the hyperbolic cosine of x.

If the correct value would cause overflow, a range error shall occur and cosh(), coshf(), and coshl() shall return the value of the macro HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively. big yikes, but it's specified 💀

• If x is NaN, a NaN shall be returned.
• If x is ±0, the value 1.0 shall be returned.
• If x is ±Inf, +Inf shall be returned.

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😭 ERRORS 😭

These functions shall fail if:

• Range Error — The result would cause an overflow.
  • 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 overflow floating-point exception shall be raised.

The following sections are informative.

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🌈 EXAMPLES 🌈

None. literally nothing, bestie. not a single example. iconic of them honestly 🎀

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🧚 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. no cap 🫶

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⭐ RATIONALE ⭐

None.

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💜 FUTURE DIRECTIONS 💜

None.

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🔥 SEE ALSO 🔥

• acosh()
• feclearexcept()
• fetestexcept()
• isnan()
• sinh()
• tanh()

The Base Definitions volume of POSIX.1‐2017, Section 4.20, Treatment of Error Conditions for Mathematical Functions, <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 whole page, bestie 🫶 this one came to you from IEEE/The Open Group, 2017, COSH(3POSIX) — go forth and compute some hyperbolic cosines, you absolute legend 👑✨