替换println 为 print
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@@ -299,7 +299,7 @@ class CreditCard {
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}
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```
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> 注意:
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> 注意:
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> `CreditCard`类的`number`属性被定义为`UInt64`类型而不是`Int`类型,以确保`number`属性的存储量在32位和64位系统上都能足够容纳16位的卡号。
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下面的代码片段定义了一个叫`john`的可选类型`Customer`变量,用来保存某个特定客户的引用。由于是可选类型,所以变量被初始化为`nil`。
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@@ -557,4 +557,3 @@ print(paragraph!.asHTML())
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paragraph = nil
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// prints "p is being deinitialized"
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```
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