📄 4-6.php3

📁 linux操作系统中 php 核心编程所有例程都是一些很不错的案例

💻 PHP3

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<HTML>
<HEAD>
<TITLE>Figure 4-6</TITLE>
</HEAD>
<BODY>
<?
	function checkInteger($Number)
	{
		if($Number > 1)
		{
			/* integer minus one is still an integer */
			return(checkInteger($Number-1));
		}
		elseif($Number < 0)
		{
			/* numbers are symmetrical, so     */
			/* check positive version          */
			return(checkInteger((-1)*$Number-1));
		}
		else
		{
			if(($Number > 0) AND ($Number < 1))
			{
				return("no");
			}
			else
			{
				/* zero and one are       */
				/* integers by definition */
				return("yes");
			}
		}
	}

	print("Is 0 an integer? " . 
		checkInteger(0) . "<BR>\n");
	print("Is 7 an integer? " . 
		checkInteger(7) . "<BR>\n");
	print("And 3.5? " . checkInteger(3.5) . "<BR>\n");
	print("What about -5? " . checkInteger(-5) . "<BR>\n");
	print("And -9.2? " . checkInteger(-9.2) . "<BR>\n");

?>
</BODY>
</HTML>

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