<HTML>
<HEAD>
<TITLE>判断整数</TITLE>
</HEAD>
<BODY>
<?
function checkInteger($Number)
{
if($Number > 1)
{
/* 整数减1仍然是整数 */
return(checkInteger($Number-1));
}
elseif($Number < 0)
{
/* 对于一个负数，*/
/* 可以分析它的绝对值*/
return(checkInteger((-1)*$Number-1));//取绝对值，把负数按整数分析
}
else
{
if(($Number > 0) AND ($Number < 1))
{
return("当然不是");
}
else
{
/* 0 和 1 是整数 */
/* 根据相关数学定义 */
return("是的");
}
}
}
print("<B>0是整数吗？</B>" .
checkInteger(0) . "<BR>\n");
print("<B>7是整数吗？</B> " .
checkInteger(7) . "<BR>\n");
print("<B>3.5呢？</B>" . checkInteger(3.5) . "<BR>\n");
print("<B>那么-5呢？</B>" . checkInteger(-5) . "<BR>\n");
print("<B>还有-9.2？</B>" . checkInteger(-9.2) . "<BR>\n");
?>
</BODY>
</HTML>
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