log1p_basic.phpt   [plain text]

--TEST--
Test log1p() - basic function test log1p()
--INI--
precision=14
--FILE--
<?php
/* Prototype  : float log1p  ( float $arg  )
 * Description: Returns log(1 + number), computed in a way that is accurate even 
 *				when the value of number is close to zero
 * Source code: ext/standard/math.c
 */

echo "*** Testing log1p() : basic functionality ***\n";

$values = array(23,
				-23,
				2.345e1,
				-2.345e1,
				0x17,
				027,
				"23",
				"23.45",
				"2.345e1",				
				null,
				true,
				false);	

echo "\n LOG1p tests\n";

foreach($values as $value) {
	echo "\n-- log1p $value --\n";
	var_dump(log1p($value));
};	


?>
===Done===
--EXPECTF--
*** Testing log1p() : basic functionality ***

 LOG1p tests

-- log1p 23 --
float(3.1780538303479)

-- log1p -23 --
float(NAN)

-- log1p 23.45 --
float(3.1966302159209)

-- log1p -23.45 --
float(NAN)

-- log1p 23 --
float(3.1780538303479)

-- log1p 23 --
float(3.1780538303479)

-- log1p 23 --
float(3.1780538303479)

-- log1p 23.45 --
float(3.1966302159209)

-- log1p 2.345e1 --
float(3.1966302159209)

-- log1p  --
float(0)

-- log1p 1 --
float(0.69314718055995)

-- log1p  --
float(0)
===Done===