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。
Probe the function func1 of class space.
探查space类的func1函数。
Probe the function func2 of class space.
探查space类的func2函数。
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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