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                你可以使用與寫入實例變量值相同的語法來讀取實例變量的值: ~~~ int x = blank.x; ~~~ 表達式blank.x表示“進入名為blank的對象中并取得x的值”。這里我們把這個值賦值給局部變量x。注意,名為x的局部變量和名為x的實例變量并不沖突。點號的作用就是明確地區分你所指的是哪一個變量。 可以將點記號用作C++表達式的一部分,所以下面代碼是合法的: ~~~ cout << blank.x << << ", " << blank.y << endl; double distance = blank.x * blank.x + blank.y * blank.y; ~~~ 第一行輸出為3, 4;第二行計算的結果是25。
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