A friend function named spacefriend, which is a friend of class space, and which takes the class object as an argument and prints the value of its variable x.
名为spacefriend的友元函数，它是space类的友元，它的参数是类对象，输出类对象的x变量的值。
A main function calls the public function func with int arguments of class space.
main函数，它调用space类中使用int参数的公共函数func。
The comprehensive function design of multiple formats, forming a new city, Texas northwest active space center, promote the urban area of the class and grade of regional value.
这种多业态的综合功能设计，形成新的城市活跃空间，打造德州西北城市区域中心，促进该区域的档次与品位的价值提升。
The comprehensive function design of multiple formats, forming a new city, Texas northwest active space center, promote the urban area of the class and grade of regional value.
这种多业态的综合功能设计，形成新的城市活跃空间，打造德州西北城市区域中心，促进该区域的档次与品位的价值提升。
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