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# define TGSOURCE "std/9899-1990/math/acos.c"
#include <math.h>
#include "errno.h"
#include "nonstd/tgmath.h"
/** arc cosine **/
TYPE TGFN(acos)(TYPE x)
{
if (x < -1 || x > 1) {
errno = EDOM; /* ARGUMENT(x) not in the range [-1, +1] */
return TGHUGE;
}
if (0) {
errno = ERANGE; /* The result cannot be represented */
/* RETURN_FAILURE(CONSTANT(HUGE_VAL), A range error occurred); */
return TGHUGE;
}
/* RETURN_SUCCESS(a value in range `[0, PI()]'); */
return (TYPE)0.0;
}
/***
compute the principal value of the arc cosine of ARGUMENT(x), which must be in
the range [-1, +1].
***/
/*
IMPLEMENTATION(The value returned on a domain error, CONSTANT(HUGE_VAL))
LINK(m)
*/
/*
STDC(1)
*/
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