改文法是什麼意思?

General 更新 2023年10月15日

c++題，改不了操作數嗎。。操作數是啥？什麼意思？d不改變語法結構是什麼意思？

就是左邊的數必須是變量,只能是一個比如b+c=9中,左邊不能有兩個變量,這樣時錯誤的。

char a = 0;

*((int*)a) = 10;

此時10左邊的是個臨時變量。

變量來源於數學，是計算機語言中能儲存計算結果或能表示值抽象概念。變量可以通過變量名訪問。在指令式語言中，變量通常是可變的；但在純函數式語言（如Haskell）中，變量可能是不可變（immutable）的。在一些語言中，變量可能被明確為是能表示可變狀態、具有存儲空間的抽象（如在Java和Visual Basic中）；但另外一些語言可能使用其它概念（如C的對象）來指稱這種抽象，而不嚴格地定義“變量”的準確外延。

急，求修改語法（僅僅是語法，如果有什麼不懂，可以聯繫我450615164,謝謝）

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