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                你可以寫出返回結構的函數。如,findCenter函數把一個Rectangle類型作為參數,返回一個Point類型的值,其中包含著該矩形中心的坐標: ~~~ Point findCenter (Rectangle& box) { double x = box.corner.x + box.width/2; double y = box.corner.y + box.height/2; Point result = {x, y}; return result; } ~~~ 調用這個函數時,我們需要傳入一個box作為參數(注意它是通過引用傳遞的),并把返回值賦給一個Point類型的變量: ~~~ Rectangle box = { {0.0, 0.0}, 100, 200}; Point center = findCenter (box); printPoint (center); ~~~ 程序輸出(50,100)。
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