55 lines
652 B
C++
55 lines
652 B
C++
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#include "stdafx.h"
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#include "defs.h"
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static void arccosh(void);
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void
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eval_arccosh(void)
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{
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push(cadr(p1));
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eval();
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arccosh();
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}
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static void
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arccosh(void)
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{
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double d;
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save();
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p1 = pop();
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if (p1->k == DOUBLE) {
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d = p1->u.d;
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if (d < 1.0)
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stop("arccosh function argument is less than 1.0");
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d = log(d + sqrt(d * d - 1.0));
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push_double(d);
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restore();
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return;
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}
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if (isplusone(p1)) {
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push(_zero);
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restore();
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return;
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}
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push_symbol(ARCCOSH);
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push(p1);
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list(2);
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restore();
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}
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static char *s[] = {
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"arccosh(1.0)",
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"0",
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"arccosh(1)",
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"0",
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};
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void
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test_arccosh(void)
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{
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test(__FILE__, s, sizeof s / sizeof (char *));
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}
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