Manual Pages for UNIX Operating System command usage for man cosh

Mathematical Library Functions                           cosh(3M)



NAME
     cosh, coshf, coshl - hyperbolic cosine function

SYNOPSIS
     c99 [ flag... ] file... -lm [ library... ]
     #include 

     double cosh(double x);


     float coshf(float x);


     long double coshl(long double x);


DESCRIPTION
     These functions compute the hyperbolic cosine of their argu-
     ment x.

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


     If the correct value would cause  overflow,  a  range  error
     occurs  and cosh(), coshf(), and coshl() return the value of
     the macro HUGE_VAL, HUGE_VALF, and HUGE_VALL, respectively.


     If x is NaN, a NaN is returned.


     If x is +_0, 1.0 is returned.


     If x is +_Inf, +_Inf is returned.


     For exceptional cases, matherr(3M) tabulates the  values  to
     be returned by cosh() as specified by SVID3 and XPG3.

ERRORS
     These functions will fail if:

     Range Error    The result would cause an overflow.

                    If the integer expression (math_errhandling &
                    MATH_ERREXCEPT)  is  non-zero,  the  overflow
                    floating-point exception is raised.

                    The cosh() function sets errno to  ERANGE  if



SunOS 5.11          Last change: 12 Jul 2006                    1






Mathematical Library Functions                           cosh(3M)



                    the result would cause an overflow.


USAGE
     An application wanting to check for exceptions  should  call
     feclearexcept(FE_ALL_EXCEPT) before calling these functions.
     On  return,  if  fetestexcept(FE_INVALID  |  FE_DIVBYZERO  |
     FE_OVERFLOW  |  FE_UNDERFLOW)  is non-zero, an exception has
     been raised. An application should either examine the return
     value  or check the floating point exception flags to detect
     exceptions.


     An application can  also  set  errno  to  0  before  calling
     cosh().  On  return,  if  errno  is  non-zero,  an error has
     occurred. The coshf()  and  coshl()  functions  do  not  set
     errno.

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|
    | MT-Level                    | MT-Safe                     |
    |_____________________________|_____________________________|
    | Standard                    | See standards(5).           |
    |_____________________________|_____________________________|


SEE ALSO
     acosh(3M), feclearexcept(3M),  fetestexcept(3M),  isnan(3M),
     math.h(3HEAD),   matherr(3M),   sinh(3M),  tanh(3M),  attri-
     butes(5), standards(5)
















SunOS 5.11          Last change: 12 Jul 2006                    2