eigenmath/floor.cpp

140 lines
1.3 KiB
C++

#include "stdafx.h"
#include "defs.h"
void sfloor(void);
static void ssfloor(void);
void
eval_floor(void)
{
push(cadr(p1));
eval();
sfloor();
}
void
sfloor(void)
{
save();
ssfloor();
restore();
}
static void
ssfloor(void)
{
double d;
p1 = pop();
if (!isnum(p1)) {
push_symbol(FLOOR);
push(p1);
list(2);
return;
}
if (p1->k == DOUBLE) {
d = floor(p1->u.d);
push_double(d);
return;
}
if (isinteger(p1)) {
push(p1);
return;
}
p3 = alloc();
p3->k = NUM;
p3->u.q.a = mdiv(p1->u.q.a, p1->u.q.b);
p3->u.q.b = mint(1);
push(p3);
if (isnegativenumber(p1)) {
push_integer(-1);
add();
}
}
static char *s[] = {
"floor(a)",
"floor(a)",
"floor(a+b)",
"floor(a+b)",
"floor(5/2)",
"2",
"floor(4/2)",
"2",
"floor(3/2)",
"1",
"floor(2/2)",
"1",
"floor(1/2)",
"0",
"floor(0/2)",
"0",
"floor(-1/2)",
"-1",
"floor(-2/2)",
"-1",
"floor(-3/2)",
"-2",
"floor(-4/2)",
"-2",
"floor(-5/2)",
"-3",
"floor(5/2.0)",
"2",
"floor(4/2.0)",
"2",
"floor(3/2.0)",
"1",
"floor(2/2.0)",
"1",
"floor(1/2.0)",
"0",
"floor(0.0)",
"0",
"floor(-1/2.0)",
"-1",
"floor(-2/2.0)",
"-1",
"floor(-3/2.0)",
"-2",
"floor(-4/2.0)",
"-2",
"floor(-5/2.0)",
"-3",
};
void
test_floor(void)
{
test(__FILE__, s, sizeof s / sizeof (char *));
}