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。

youdao

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。

youdao

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。

youdao