prolog教程裡都會提到 x=x+1 或 x is x+1 都是不合法的 也就是當is的左邊變數有值 或is右邊的變數沒有值 都是不合法的指令 那要如何作到x=x+1 和修改一個有值的變數呢? (有值變數不能放is左邊...)
請指教 感謝
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