在函式呼叫的時候， 引數傳遞到參數的方法可用傳值或者傳址方式。
在函式結束可選擇 return 一個值或者不回傳值， 若今天需要回傳兩個以上值， 就可透過傳址呼叫來達成這個目的。
此範例程式就以三種方式來示範參數傳遞的方式： call by value (傳值呼叫) call by reference (傳址呼叫) Output parameter (傳出呼叫)
詳細輔助說明：https://blog.twshop.asia/c-%e5%8f%83%e6%95%b8%e5%82%b3%e9%81%9e%e5%85%a5%e9%96%80/
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