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                ## 1 常量定義語法 ``` const a = 55 // 允許 const hello = "Hello World" const typedhello string = "Hello World" ``` 多個常量也可以一起聲明: ~~~ const ( pi = 3.1415 e = 2.7182 ) ~~~ `const`同時聲明多個常量時,如果省略了值則表示和上面一行的值相同。 例如: ~~~ const ( n1 = 100 n2 n3 ) ~~~ 上面示例中,常量`n1、n2、n3`的值都是`100` ### 2 iota `iota`是`go`語言的常量計數器,只能在常量的表達式中使用。`iota`在`const`關鍵字出現時將被重置為`0`。`const`中每新增一行常量聲明將使`iota`計數一次(`iota`可理解為`const`語句塊中的行索引)。 使用`iota`能簡化定義,在定義枚舉時很有用 連續快速賦值: ~~~ const ( Monday = iota + 1 Tussday Wednesday Thursday Friday Saturday Sunday ) const ( n1 = iota //0 n2 //1 n3 //2 n4 //3 ) ~~~
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