HP-UX Reference (11i v2 04/09) - 3 Library Functions N-Z (vol 7)

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tand(3M) tand(3M)

NAME

tand( ), tandf( ), tandl( ), tandw( ), tandq( ) - tangent functions of an argument speciﬁed in degrees

SYNOPSIS

#include <math.h>

double tand(double x);

float tandf(float x);

Itanium(R)-based System Only

long double tandl(long double x);

extended tandw(extended x);

quad tandq(quad x);

DESCRIPTION

tand() returns the tangent of x (x speciﬁed in degrees).

On PA-RISC systems,

tand() may lose accuracy when x is far from zero.

tandf() is a float version of tand(); it takes a

float argument and returns a float result.

Itanium-based System Only

tandl() is a long double version of tand(); it takes a long double argument and returns a

long double result.

tandw() is an extended version of tand(); it takes an extended argument and returns an

extended result.

tandq() is equivalent to tandl() on HP-UX systems.

USAGE

To use these functions compile either with the default

-Ae option or with the

-Aa and

-D_HPUX_SOURCE options.

To use (for Itanium-based systems)

tandw() or tandq(), 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 VALUE

tand(±0) returns ±0.

If x is ±INFINITY,

tand() returns NaN and raises the invalid exception.

If x is NaN,

tand() returns NaN.

ERRORS

No errors are deﬁned.