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                ## 2.4. 賦值 使用賦值語句可以更新一個變量的值,最簡單的賦值語句是將要被賦值的變量放在=的左邊,新值的表達式放在=的右邊。 ```Go x = 1 // 命令變量的賦值 *p = true // 通過指針間接賦值 person.name = "bob" // 結構體字段賦值 count[x] = count[x] * scale // 數組、slice或map的元素賦值 ``` 特定的二元算術運算符和賦值語句的複合操作有一個簡潔形式,例如上面最後的語句可以重寫爲: ```Go count[x] *= scale ``` 這樣可以省去對變量表達式的重複計算。 數值變量也可以支持`++`遞增和`--`遞減語句(譯註:自增和自減是語句,而不是表達式,因此`x = i++`之類的表達式是錯誤的): ```Go v := 1 v++ // 等價方式 v = v + 1;v 變成 2 v-- // 等價方式 v = v - 1;v 變成 1 ``` {% include "./ch2-04-1.md" %} {% include "./ch2-04-2.md" %}
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