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                # Scala 函數嵌套 我么可以在 Scala 函數內定義函數,定義在函數內的函數稱之為局部函數。 以下實例我們實現階乘運算,并使用內嵌函數: ``` object Test { def main(args: Array[String]) { println( factorial(0) ) println( factorial(1) ) println( factorial(2) ) println( factorial(3) ) } def factorial(i: Int): Int = { def fact(i: Int, accumulator: Int): Int = { if (i <= 1) accumulator else fact(i - 1, i * accumulator) } fact(i, 1) } } ``` 執行以上代碼,輸出結果為: ``` $ scalac Test.scala $ scala Test 1 1 2 6 ```
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