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HP-UX 11i Version 1.5 Reference Volume 4, Section 3: Libraries > a
acosh(3M) |
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NAMEacosh(), acoshf(), acoshl(), acoshw(), acoshq() — arc hyperbolic cosine functions DESCRIPTIONacosh() returns the arc hyperbolic cosine of x , in the range +zero to +INFINITY. IA-64 ONLY:acoshf() is a float version of acosh(); it takes a float argument and returns a float result. acoshl() is a long double version of acosh(); it takes a long double argument and returns a long double result. acoshw() is an extended version of acosh(); it takes an extended argument and returns an extended result. acoshq() is equivalent to acoshl() on HP-UX systems. USAGETo use (for IA-64 systems) acoshf(), acoshl(), acoshw(), or acoshq(), compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options. To use (for IA-64 systems) acoshw() or acoshq(), compile also with the -fpwidetypes option. To use any of these functions, make sure your program includes <math.h>, and link in the math library by specifying -lm on the compiler or linker command line. For more information, see the HP-UX Floating-Point Guide. RETURN VALUEacosh(1) returns +0. If x < 1.0, acosh() returns NaN and raises the invalid exception. If x is +INFINITY, acosh() returns +INFINITY. If x is NaN, acosh() returns NaN. When it raises no other exception, whether acosh() raises the inexact exception is unspecified. |
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