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                當你把一個結構作為實參傳遞時,請牢記實參和形參并非同一變量。而是最初有著相同值的兩個變量(一個在調用者中,另一個在被調用者中)。比如,當調用printPoint時,棧圖看起來會是這樣: ![enter image description here](https://box.kancloud.cn/2015-09-01_55e5995b96131.jpg) 如果printPoint改變了p的一個實例變量,blank并不會隨之受到影響。當然,printPoint函數沒理由去修改它的參數,因而兩個函數之間的這種隔離是合適的。 這種類型的參數傳遞被稱為"按值傳遞",因為傳遞給函數的是結構(或其他類型)的值。
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