5.22作业

#include <iostream>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
using namespace std;
class mystring
{
	char* p;
	public:
	mystring(const char* str)
	{
		p = (char*)malloc(20);
		if(p)strcpy(p,str);
	}
	void copy(const mystring &other)
	{
		strcpy(p,other.p);
	}
	void copy(const char* str)
	{
		strcpy(p,str);
	}
	void append(const mystring &other)
	{
		strcat(p,other.p);
	}
	void append(const char* str)
	{
		strcat(p,str);
	}
	bool compare(const char* str)
	{
		return strcmp(p,str) == 0;
	}
	bool compare(const mystring &other)
	{
		return strcmp(p,other.p) == 0;
	}
	void show()
	{
		cout << "p=" <<p<<endl;
	}
	~mystring()
	{
		free(p);
	}
};
int main(int argc, const char *argv[])
{
	mystring str = "hello";
	str.show();
	str.copy("world");
	str.show();
	mystring ptr = "world";
	str.copy(ptr);
	str.show();
	str.append("world");
	str.show();
	str.append(ptr);
	str.show();
	if(str.compare("world"))
	{
		cout << "不相等"<<endl;
	}
	else
	{
		cout << "相等"<<endl;
	}
	if(str.compare(ptr))
	{
		cout << "不相等"<<endl;
	}
	else
	{
		cout << "相等"<<endl;
	}

	return 0;
}