string.h

二叉树的 学生成绩管理系统 c

#ifndef STRING_CLASS
#define STRING_CLASS

#include <iostream.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

const int maxlen=128;

class String
{
private:
	int curlen;
	char *ch;

public:
	String(char *init="");
	String(const String & ob);
//	~String() {delete []ch;};
	String & operator =(const String & ob);
	String & operator =(char *s);
	int operator ==(const String & ob) const
	{return strcmp(ch,ob.ch)==0;}
	int operator ==(char *s) const
	{return strcmp(ch,s)==0;}
	friend int operator ==(char *s,const String & ob)
	{return strcmp(s,ob.ch)==0;}
	int operator !=(const String & ob) const
	{return strcmp(ch,ob.ch)!=0;}
	int operator !=(char *s) const
	{return strcmp(ch,s)!=0;}
	friend int operator !=(char *s,const String & ob)
	{return strcmp(s,ob.ch)!=0;}
	friend ostream & operator<<(ostream &os,const String & s);
	friend istream & operator>>(istream &is,String & s);
	int Length() const{return curlen;}
	int IsEmpty() const {return curlen==1;}
	void Clear() {curlen=1;}
};

#endif