一个C++程序的示例(STATIC,FRIEND)

#include <iostream>
using namespace std;

class MyClass
{
 public:
  MyClass(){ mchar = 'A';};
  static char *str ;
  static void print( void );
  friend void printprivate( MyClass &myclass );
 private:
  char mchar;
};

char * MyClass:: str = "This is a static var";

void MyClass::print( void )
{
 cout << str << endl;
}

void printprivate( MyClass &myclass )
{
 cout << myclass.mchar <<endl;
}

void main()
{
 MyClass::print();
 MyClass myclass;
 printprivate( myclass );

}

 

char * MyClass:: str = "This is a static var";在初始化 str的时候,因改讲类型写完整
例如:
    你声明的是:
        static char *str;
    那么你在初始化的时候就该这样初始化:
        char * MyClass::str = “this is a static var”;
friend :有元函数,不是类的一部分,但是却能访问类中的私有成员.