31 lines
316 B
C++
31 lines
316 B
C++
#include "defs.h"
|
|
|
|
void
|
|
eval_sgn(void)
|
|
{
|
|
push(cadr(p1));
|
|
eval();
|
|
sgn();
|
|
}
|
|
|
|
void
|
|
sgn(void)
|
|
{
|
|
save();
|
|
|
|
p1 = pop();
|
|
|
|
if (!isnum(p1)) {
|
|
push_symbol(SGN);
|
|
push(p1);
|
|
list(2);
|
|
} else if (iszero(p1))
|
|
push_integer(0);
|
|
else if (isnegativenumber(p1))
|
|
push_integer(-1);
|
|
else
|
|
push_integer(1);
|
|
|
|
restore();
|
|
}
|