string类的应用

[baigoo]

// String.cpp : Defines the entry point for the console application.
// description: string class usage.

#include "stdafx.h"
#include <string>
#include <iostream>
//#define TEST

using std::cout;
using std::cin;
using std::endl;
using std::string;

//define class Editor.
/***********************************************************************************/

class Editor
{
public:
	Editor():current_pos(0),next_pos(0),strContent(""){}
	Editor(const string& strData):current_pos(0),next_pos(0),strContent(strData){}
	~Editor(){}

	int Find(const string& strData);
	int Insert(string::size_type npos,const string &strData);
	int Replace(const string& strSource,const string& strTarget);
	int Remove(const string& strData);
	void Move_pos_to_first();
	void Print();

private:
	string::size_type current_pos;
	string::size_type next_pos;
	string strContent;
};

//Find() define
int Editor::Find(const string& strData)
{
	current_pos = strContent.find(strData,next_pos);
	if(current_pos != string::npos)
	{
		cout << "Find " << strData << " at postion:" << current_pos << endl;
		next_pos = current_pos + strData.length();
	}
	else
	{
		cout << "Error:Can't find " << strData << endl;
		next_pos = current_pos = 0;
	}
	return current_pos;
}

//Insert() define
int Editor::Insert(string::size_type npos,const string& strData)
{ 
	strContent.insert(npos, strData);
	return 0;
}

//Replace() define
int Editor::Replace(const string& strSource,const string& strTarget)
{
	current_pos = strContent.find(strSource, next_pos);
	if(current_pos != string::npos)
	{
		strContent.replace(current_pos, strSource.length(), strTarget);
		next_pos = current_pos + strSource.length();
	}
	else
	{
		cout << "Error:Can't find " << strSource << endl;
		next_pos = current_pos = 0;
	}
	return 0;
}

//Remove() define
int Editor::Remove(const string& strData)
{
	current_pos = strContent.find(strData, next_pos);
	if(current_pos != string::npos)
	{
		strContent.erase(current_pos, strData.length());
		next_pos = current_pos + strData.length();
	}
	else
	{
		cout << "Error:Can't find " << strData << endl;
		next_pos = current_pos = 0;
	}
	return 0;
}

//Move_pos_to_first() define
void Editor::Move_pos_to_first()
{
	current_pos = next_pos = 0;
}

//Print() define
void Editor::Print()
{
	cout << strContent << endl;
}

/***********************************************************************************/

//main
int _tmain(int argc, _TCHAR* argv[])
{
	//test
#ifdef TEST
	string strWebsite;
	strWebsite = "www.baidu.com";
	cout << "strWebsite = " << strWebsite << endl;

	//string assignment
	string cpyWebsite = strWebsite;
	cout << "cpyWebsite = " << cpyWebsite << endl;
	
	cout << "strContent:" << endl;
	string strContent = "www.baidu.com,this is a c++ program and we use STL string class!";
	cout << strContent << endl;

	//string :find()
	int pos = strContent.find("baidu",0);
	if(pos != strContent.npos)
	{
		cout << "Find \"baidu\" at position:" << pos << endl;
	}
	else
	{
		cout << "Can't find \"baidu\"!" << endl;
	}

	//string :erase()
	strContent.erase(4, 5);
	cout << "After erase:" << endl;
	cout << strContent << endl;

	//string :insert()
	strContent.insert(4, "google");
	cout << "After insert:" << endl;
	cout << strContent << endl;

	//string :replace()
	strContent.replace(4, 6, "hao123");
	cout << "After replace:" << endl;
	cout << strContent << endl;
	cout << "strlen(strContent) = " << strContent.length() + 1 << endl;
	cout << "strContent.npos = " << strContent.npos << endl;
	cout << "string::npos = " << string::npos << endl;
#endif

	//define an object o_Editor belongs to class Editor.
	Editor o_Editor = "www.baidu.com is a website.This is a c++ program and\
					  we use STL string.baidu is a search engine in China.";

	//在字符串连续寻找一串字符，当找完整个字符串都找不到时，会再次从头开始寻找
	for(int i = 0;i < 5;i ++)
	{
		o_Editor.Find("baidu");
	}

	//把位置置零
	o_Editor.Move_pos_to_first();
	o_Editor.Print();

	//删除长串字符串中的"baidu"
	for(int i = 0;i < 3;i ++)
	{
		o_Editor.Remove("baidu");
	}
	o_Editor.Print();

	//插入一个字符串"google"
	o_Editor.Move_pos_to_first();
	o_Editor.Insert(4, "google");
	o_Editor.Insert(78, "google");
	o_Editor.Print();

	//替换一个字符串
	o_Editor.Move_pos_to_first();
	for(int i = 0;i < 3;i ++)
	{
		o_Editor.Replace("google", "hao123");
	}
	o_Editor.Print();
	o_Editor.Move_pos_to_first();

	return 0;
}

[allenltiverson]

这是想说明什么？

[baigoo]

不是，学习笔记，非技术区发的贴！

[我系麦叔叔]

分享技术贴？

[lm_whales]

不错。。。。。。。。。

[零度的折翅]

引用 3 楼 chenyan2010521 的回复:

不是，学习笔记，非技术区发的贴！

原来是这样的呀！！！