Next, define class Screen, including a friend declaration for clear.

其次，定义类的屏幕，包括一个明确的朋友宣言。

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You need to define member function declaration.

请定义成员函数声明。

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You define a variable with a single declaration statement.

可以使用单个声明语句定义变量。

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You define a variable with a single declaration statement.

可以使用单个声明语句定义变量。

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