中国DOS联盟

//阶乘	{s11ss 2007-12-16}



var host,re,i,num,answer=1;



//ScriptHost:

host=WScript.FullName;

host=host.substring(host.length-11,host.length).toLowerCase();

if(host=="wscript.exe")	{

	host=new ActiveXObject("WScript.Shell");

	host.Run("cmd /ccscript/nologo \""+WScript.ScriptFullName+"\"");

	WScript.Quit();

}



//Receive a number:

re=/^\d+$/gi;

while(!re.test(num))	{

	WScript.Echo("Please input the number:");

	num=WScript.StdIn.ReadLine();

	num=num.toString();

}



//Calculate:

for(i=1;i<=num;i++)	answer=answer*i



//Print:

WScript.StdOut.Write(num+"!\n=");

for(i=num;i>=2;i--)	WScript.StdOut.Write(i+"*");

if(num>1)	WScript.StdOut.Write("1\n="+answer); else	WScript.StdOut.Write("1");

WScript.Stdin.ReadLine();