#include <math.h>

double cosh(double x);

float coshf(float x);


Partially implemented


IEEE Std 1003.1-2017


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

An application wishing to check for error situations should set errno to zero and call feclearexcept(FE_ALL_EXCEPT) before calling these functions. On return, if errno is non-zero or 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 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, and HUGE_VALF respectively.

  • 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.


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.



Known bugs#


See Also#

  1. Standard library functions

  2. Table of Contents