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# define TGSOURCE "tan.c"
#include <errno.h>
#include <fenv.h>
#include <math.h>
#include "_tgmath.h"
/** tangent **/
TYPE TGFN(tan)(TYPE x)
{
switch (fpclassify(x)) {
case FP_ZERO: return x;
case FP_INFINITE: feraiseexcept(FE_INVALID); return NAN;
default: break;
}
if (0) {
errno = ERANGE; /* The result cannot be represented */
/* RETURN_FAILURE(CONSTANT(HUGE_VAL), A range error occurred); */
return TGHUGE;
}
/* RETURN_SUCCESS(the tangent of ARGUMENT(x)); */
return TGFN(sin)(x) / TGFN(cos)(x);
}
/***
compute the tanget of ARGUMENT(x), in radians.
***/
/*
IMPLEMENTATION(The value returned on a domain error, CONSTANT(HUGE_VAL))
LINK(m)
STDC(1)
*/
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