C++练习笔记_1

C++练习笔记_1

Testing。。。Testing。。。

CopyThat。

嘿嘿，今天下了个LiveWriter ，挺方便的，

就是这个Paste from Visual Studio貌似对中文支持不是太好(ps:在vs下另存为为utf8，问题解决)。。。

对C++的探索真的是永无止境，

对这个String自己还一直以为是小菜一碟，

没想到遇到个重载的问题，乘机写了个cString类，

遇到了不少麻烦，还得谨记，纸上得来终觉浅，绝知此事要躬行！

还有，以后要勤加写博，有益身心！

cString.h

#pragma  once
//cString运算符重载实验
//提供多种运算符，及对ANSI和Unicode的支持
//纸上得来终觉浅，绝知此事要躬行！
//Zephyr 2010/11/18
#include "assert.h"
#include <Windows.h>
#define  SafeDelete(p) if(p!=NULL){delete p;p=NULL;}
#ifdef  UNICODE   
#define COUT wcout
#else
#define  COUT cout
#endif

class cString
{
public:
    cString(TCHAR *pChar=NULL);
    cString(cString &str);
    ~cString();
    void  operator =(cString &str);
    void  operator +=(cString &str);
    cString  operator +(cString &str);
    bool operator >(cString &str);
    bool operator <(cString &str);
    bool operator ==(cString &str);
    TCHAR operator [](int i);
    int GetLength(){return m_iLength;}
    const TCHAR* GetPtr(){return m_pStr;}
    void Show();
    friend ostream& operator<< (ostream&,cString&);
private:
    int m_iLength;
    TCHAR *m_pStr;
};
cString::cString(TCHAR *pChar)
{
    m_iLength=0;//int ???笨蛋你个笨蛋
    m_pStr=NULL;
    if(pChar==NULL)
        return;
    TCHAR *p=pChar;//Bug Nothing!!!!!
    while((*p++)!=NULL)

        m_iLength++;
    m_pStr=new TCHAR[m_iLength+1];
    assert(m_pStr!=NULL);
    //wcout<<"字符串初始化："<<pChar<<endl;
    //int size=sizeof(TCHAR);
    memcpy(m_pStr,pChar,(m_iLength+1)*sizeof(TCHAR));
    //wcout<<"串初始化化："<<m_pStr<<endl;
}
cString::cString(cString &str)
{
    if(this!=&str)
    {
//         if(m_iLength>0)
//             SafeDelete(m_pStr);
        m_iLength=str.GetLength();
        m_pStr=new TCHAR[m_iLength+1];
        assert(m_pStr!=NULL);
        memcpy(m_pStr,str.m_pStr,(m_iLength+1)*sizeof(TCHAR));
    }
}
cString::~cString()
{
    SafeDelete(m_pStr);
}
//cString&
void cString::operator =(cString &str)
{
    if(this!=&str)
    {
        SafeDelete(m_pStr);
        m_iLength=str.GetLength();
        m_pStr=new TCHAR[m_iLength+1];
        assert(m_pStr!=NULL);
        memcpy(m_pStr,str.m_pStr,(m_iLength+1)*sizeof(TCHAR));
    }
    //return *this;
}
void  cString::operator +=(cString &str)
{
    int iOldLength=m_iLength;
    int iIter=0;
    m_iLength+=str.GetLength();
    TCHAR *pNewStr=new TCHAR[m_iLength+1];
    while(iIter<iOldLength)
        pNewStr[iIter++]=m_pStr[iIter];
    int i=0;
    while(iIter<m_iLength)
        pNewStr[iIter++]=str.m_pStr[i++];
    pNewStr[iIter]=NULL;
    SafeDelete(m_pStr);
    m_pStr=pNewStr;
}
cString  cString::operator+(cString &str)
{
    cString newStr;
    int iIter=0;
    newStr. m_iLength=m_iLength+str.GetLength();
    TCHAR *pNewStr=new TCHAR[newStr. m_iLength+1];
    while(iIter<m_iLength)
        pNewStr[iIter++]=m_pStr[iIter];
    int i=0;
    while(iIter<newStr. m_iLength)
        pNewStr[iIter++]=str.m_pStr[i++];
    pNewStr[iIter]=NULL;
    newStr.m_pStr=pNewStr;
    return newStr;
}

bool cString::operator >(cString &str)
{
    if(m_iLength>=str.GetLength())
        return true;
    else 
        return false;
}
bool cString::operator <(cString &str)
{
    if(m_iLength<str.GetLength())
        return true;
    else 
        return false;
}
bool cString::operator ==(cString &str)
{
    if(m_iLength!=str.GetLength())
        return false;
    int i=0;
    while ((i++)<m_iLength)
    {
        if(m_pStr[i]!=str.m_pStr[i])
            return false;
    }
    return true;
}
TCHAR cString::operator [](int i)
{
    if(i<0||i>m_iLength)
        return NULL;
    return m_pStr[i];
}
void cString::Show()
{
    COUT<<m_pStr<<endl;
}
ostream& operator<<(ostream& os,cString& str)
{
    os << str.m_pStr;
    return os;
}

Main.cpp

#include <iostream>
using namespace  std;
#include "cString.h"
#include <string>
void main()
{
    int size=sizeof(char);//char在ANSI和Unicode下不变
    int size2=sizeof(TCHAR);
    std::COUT.imbue(std::locale("chs"));  
    TCHAR *wStr=TEXT("I Got it 你呢？");
    COUT<<wStr<<endl;
    cString p1;
    cString p2(TEXT("你们好，我将降临！"));
    p1=p2;
//     COUT<<"P2 Vaule: "<<p2.GetPtr()<<endl;
//     COUT<<"P1 Vaule: "<<p1.GetPtr()<<endl;
    cString p3(TEXT("勇Nani"));
    TCHAR cStr;
    if(p1>p3)
        cStr=p3[0];
    COUT<<cStr<<endl;
    p2+=p3;
    cString p4(p2);
    //p4(p3);
    cString temp=p1+p3;
    cout<<p2<<endl;//这个 有点无奈 先放下
    p2.Show();
    temp.Show();
    if(temp==p2)
        COUT<<TEXT("我们一样的~")<<endl;
    system("pause");
}

代码很简单，就不解释了，纯粹为了试验，呵呵