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HP-UX Reference Volume 4 of 5 > ttand(3M) |
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NAMEtand(), tandf() — degree-valued tangent functions DESCRIPTIONtand() is a degree-valued version of the tan() function. It returns the tangent of x (x specified in degrees). 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. tand() and tandf() are not specified by any standard, but tandf() is named in accordance with the conventions specified in the "Future Library Directions" section of the ANSI C standard. To use these functions, compile either with the default -Ae option or with the -Aa and -D_HPUX_SOURCE options. Make sure your program includes <math.h>. Link in the math library by specifying -lm on the compiler or linker command line. RETURN VALUEIf x is NaN or ±INFINITY, tand() returns NaN. If the correct value after rounding would be smaller in magnitude than MINDOUBLE, tand() returns zero. If the correct value would overflow, tand() returns ±HUGE_VAL and sets errno to [ERANGE]. |
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