proj9_05.cpp

C++程序设计教程的全部源代码 包含与教程同步的PPT 方便学习

#include <iostream.h>
#include <string.h>
class String
{
private:
	char *str;
public:
    String(char *s = "")
   	{
		int length = strlen(s);
		str = new char[length+1];
		strcpy(str , s);
	}
	~String() 		       //析构函数
	{
		delete[] str;
	}
	String & String::operator = (String & s)
	{			
		delete[] str;
		int length = strlen(s.str);
		str = new char[length+1];
		strcpy( str , s.str);
		return( *this );
	}
	
	void display()
	{
		cout << str;
	}
};
void main()
{
	String s1("Welcome to my world \n");
	String s2;
	s2 = s1;
	s1.display();
	s2.display();
}