64 lines
738 B
C++
64 lines
738 B
C++
#include "stdafx.h"
|
|
#include "defs.h"
|
|
|
|
void
|
|
eval_arccosh(void)
|
|
{
|
|
push(cadr(p1));
|
|
eval();
|
|
arccosh();
|
|
}
|
|
|
|
void
|
|
arccosh(void)
|
|
{
|
|
double d;
|
|
save();
|
|
p1 = pop();
|
|
if (car(p1) == symbol(COSH)) {
|
|
push(cadr(p1));
|
|
restore();
|
|
return;
|
|
}
|
|
if (isdouble(p1)) {
|
|
d = p1->u.d;
|
|
if (d < 1.0)
|
|
stop("arccosh function argument is less than 1.0");
|
|
d = log(d + sqrt(d * d - 1.0));
|
|
push_double(d);
|
|
restore();
|
|
return;
|
|
}
|
|
if (isplusone(p1)) {
|
|
push(zero);
|
|
restore();
|
|
return;
|
|
}
|
|
push_symbol(ARCCOSH);
|
|
push(p1);
|
|
list(2);
|
|
restore();
|
|
}
|
|
|
|
#if SELFTEST
|
|
|
|
static char *s[] = {
|
|
|
|
"arccosh(1.0)",
|
|
"0",
|
|
|
|
"arccosh(1)",
|
|
"0",
|
|
|
|
"arccosh(cosh(x))",
|
|
"x",
|
|
};
|
|
|
|
void
|
|
test_arccosh(void)
|
|
{
|
|
test(__FILE__, s, sizeof s / sizeof (char *));
|
|
}
|
|
|
|
#endif
|