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                ### 概述 另一個創建變量的方法是調用內建的new函數.表達式new(T)將創建一個T類型的匿名變量,初始化為T類型的零值,然后返回變量地址,返回的指針類型為*T. 簡單的說就是new(T)創建了一個T類型值為零值的指針. ### 實例 ~~~ func main() { var p *int p = new(int) *p = 100 fmt.Println(*p) p1 := new(int) //自動推導類型 *p1 = 200 fmt.Println(*p1) } ~~~ ### 交換兩個變量的值 #### 普通做法 ~~~ func main() { a := 10 b := 20 a, b = swap(a, b) fmt.Println(a, b) } func swap(a, b int) (c, d int) { c, d = b, a return } ~~~ #### 使用指針 ~~~ func main() { a := 10 b := 20 swap(&a, &b) fmt.Println(a, b) } func swap(a, b *int) { *a, *b = *b, *a return } ~~~
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