[問題] 計算出!n(n階層)之值
開發平台(Platform): (Ex: VC++, GCC, Linux, ...)
Dev C++
額外使用到的函數庫(Library Used): (Ex: OpenGL, ...)
無
問題(Question)：
寫一個程式讀入n的值(整數)，計算出其!n(n階層)的值。
註:0!=1，若n<0則不予計算。
錯誤結果(Wrong Output)：
http://ppt.cc/Tfj_
程式碼(Code)：(請善用置底文網頁, 記得排版)
http://codepad.org/yCPw58YF
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