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03_Swift2基础之基本数据类型

1. 整数

 整数就是没有小数部分的数字,比如`42`和`-23`。整数可以是`有符号`(正、负、零)或者`无符号`(正、零)。

 Swift 提供了8,16,32和64位的有符号和无符号整数类型。这些整数类型和 C语言的命名方式很像,比如8位无符号整数类型是`UInt8`,32位有符号整数类型是`Int32`。就像 Swift 的其他类型一样,整数类型采用大写命名法。

 1> 整数范围

  你可以访问不同整数类型的`min`和`max`属性来获取对应类型的最大值和最小值:

     let minValue = UInt8.min  // minValue 为 0,是 UInt8 类型的最小值

     let maxValue = UInt8.max  // maxValue 为 255,是 UInt8 类型的最大值

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

03_Swift2基础之基本数据类型

   * 在64位平台上,`Int`和`Int64`长度相同。

  除非你需要特定长度的整数,一般来说使用`Int`就够了。这可以提高代码一致性和可复用性。即使是在32位平台上,`Int`可以存储的整数范围也可以达到`-2147483648`~`2147483647`,大多数时候这已经足够大了。

 3>UInt(无符号整型)

  Swift 也提供了一个特殊的无符号类型`UInt`,长度与当前平台的原生字长相同(具体范围见 1>整数范围):

   在32位平台上,`UInt`和`UInt32`长度相同。

   在64位平台上,`UInt`和`UInt64`长度相同。

  > 注意:尽量不要使用`UInt`,除非你真的需要存储一个和当前平台原生字长相同的无符号整数。除了这种情况,最好使用`Int`,即使你要存储的值已知是非负的。

  统一使用`Int`可以提高代码的可复用性,避免不同类型数字之间的转换,并且匹配数字的类型推测,请参考[类型安全和类型推测](#type_safety_and_type_inference)。

2. 浮点数

 

 1> 浮点数概述

  浮点数是有小数部分的数字,比如`3.14159`,`0.1`和`-273.15`。

  浮点类型比整数类型表示的范围更大,可以存储比`Int`类型更大或者更小的数字。Swift 提供了两种有符号浮点数类型:

   `Double`表示64位浮点数。当你需要存储很大或者很高精度的浮点数时请使用此类型。

   `Float`表示32位浮点数。精度要求不高的话可以使用此类型。

  > 注意:`Double`精确度很高,至少有15位数字,而`Float`最少只有6位数字。选择哪个类型取决于你的代码需要处理的值的范围。

03_Swift2基础之基本数据类型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

  上面是一个正无穷数, 自然还存在负无穷数, 如下图:

03_Swift2基础之基本数据类型

  在Swift中还存在其他的一些奇特的类型, 大家感兴趣可以研究一下

03_Swift2基础之基本数据类型      } else {
         println("Eww, turnips are horrible.")
      }
      // 输出 "Eww, turnips are horrible."

  条件语句,例如`if`,请参考[控制流]。

  如果你在需要使用`Bool`类型的地方使用了非布尔值,Swift 的类型安全机制会报错。下面的例子会报告一个编译时错误:

   let i = 1

   if i {
          // 这个例子不会通过编译,会报错
      }

  然而,下面的例子是合法的:

   let i = 1
       if i == 1 {
         // 这个例子会编译成功
       }

  `i == 1`的比较结果是`Bool`类型,所以第二个例子可以通过类型检查。类似`i == 1`这样的比较,请参考[基本操作符]。




原标题:03_Swift2基础之基本数据类型

关键词:数据类型

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