字符串类报告（里面包含源代码）

类中运算符的重载应用字符串类一、实验内容定义字符串类，并对构造函数进行重载，对主要运算符进行重载，定义对字符串进行操作的其它函数，通过以上操作实现对字符串的基本操作。二、功能模块简介1定义字符串类class Tstringpublic:/构造函数TString();/带有 TString 类常量的构造函数TString(const TString/带有字符指针参变量的构造函数TString(char* src);/析构函数TString();private:char* m_pBuf;2字符串赋值操作：赋值运算符“=“重载public:TString/对赋值运算符“=“进行重载TString3字符串连接操作：连接运算符“+“重载public:TString/对连接运算符“+“进行重载TString4字符串连接、赋值操作：赋值运算符“+=“重载public:TString/对连接、赋值运算符“+=“进行重载TString5求字符串中的单个字符元素操作：下标运算符“重载public:char/对下标运算符“进行重载6求字符串的子串1)求指定的字符串的左边几个字符public:TString Left(int nCount);/求左边几个字符2)求指定的字符串的右边几个字符public:TString Right(int nCount);/求右边几个字符3)求指定的字符串的某个位置开始的几个字符public:TString Mid(int nPos,int nCount);/求某个位置开始的几个字符7求字符串的长度public:int Length();/求字符串的长度8判断字符串是否为空public:bool IsEmpty();/判断字符串是否为空9清空字符串public:void Empty();/清空字符串10输出字符串public:void Print();/输出字符串11字符串类内部函数(私有函数)private:void SetValue(char* src);三、程序代码#include #include class TStringpublic:/构造函数TString();/带有 TString 类常量的构造函数TString(const TString/带有字符指针参变量的构造函数TString(char* src);/析构函数TString();public:/求字符串的长度int Length();/判断字符串是否为空bool IsEmpty();/清空字符串void Empty();/输出字符串void Print();private:void SetValue(char* src);public:/对下标运算符“进行重载char/对赋值运算符“=“进行重载TStringTString/对连接运算符“+“进行重载TStringTString/对连接、赋值运算符“+=“进行重载TStringTStringpublic:/求左边几个字符TString Left(int nCount);/求右边几个字符TString Right(int nCount);/求某个位置开始的几个字符TString Mid(int nPos,int nCount);private:char* m_pBuf;/-TString:TString()m_pBuf = NULL;TString:TString(const TStringTString:TString(char* src)this-SetValue(src);TString:TString()if(m_pBuf)delete m_pBuf;/-int TString:Length()if(m_pBuf=NULL)return 0;return strlen(m_pBuf)+1;bool TString:IsEmpty()if(m_pBuf=NULL)return true;return false;void TString:Empty()if(m_pBuf)delete m_pBuf;m_pBuf = NULL;void TString:Print()if(m_pBuf=NULL)coutm_pBuf)return *this;/以前有分配空间if(m_pBuf)delete m_pBuf;/释放以前的分配空间SetValue(src);return *this;TStringtemp=new TString();temp-m_pBuf=NULL;/传来的对象为空if(src.m_pBuf = NULL)return *this;if(m_pBuf=src.m_pBuf)int nLen=2*strlen(src.m_pBuf)+1;temp-m_pBuf=new charnLen;strcpy(temp-m_pBuf,src.m_pBuf);strcat(temp-m_pBuf,src.m_pBuf);else if(m_pBuf)int nLen = strlen(src.m_pBuf)+strlen(m_pBuf)+1;temp-m_pBuf = new charnLen;strcpy(temp-m_pBuf,m_pBuf);strcat(temp-m_pBuf,src.m_pBuf);elseint nLen = strlen(src.m_pBuf)+1;temp-m_pBuf = new charnLen;strcpy(temp-m_pBuf,src.m_pBuf);return *temp;TStringtemp=new TString();temp-m_pBuf=NULL;if(src=NULL)return *this;else if(m_pBuf)int nLen = strlen(m_pBuf)+strlen(src)+1;temp-m_pBuf = new charnLen;strcpy(temp-m_pBuf,m_pBuf);strcat(temp-m_pBuf,src);elseint nLen = strlen(src)+1;temp-m_pBuf=new charnLen;strcpy(temp-m_pBuf,src);return *temp;TStringif(m_pBuf=src.m_pBuf)int nLen=2*strlen(src.m_pBuf)+1;char *temp=src.m_pBuf;m_pBuf=new charnLen;strcpy(m_pBuf,temp);strcat(m_pBuf,temp);else if(m_pBuf)int nLen=strlen(src.m_pBuf)+strlen(m_pBuf)+1;char* temp=m_pBuf;m_pBuf=new charnLen;strcpy(m_pBuf,temp);strcat(m_pBuf,src.m_pBuf);elseint nLen=strlen(src.m_pBuf)+1;m_pBuf=new charnLen;strcpy(m_pBuf,src.m_pBuf);return *this;TStringif(m_pBuf)int nLen=strlen(m_pBuf)+strlen(src)+1;char *temp=m_pBuf;m_pBuf=new charnLen;strcpy(m_pBuf,temp);strcat(m_pBuf,src);elseint nLen=strlen(src)+1;m_pBuf=new charnLen;strcpy(m_pBuf,src);return *this;/-/求左边几个字符TString TString:Left(int nCount)TString temp;int i;if(m_pBuf=NULL)temp.m_pBuf=NULL;else if(nCountLength()temp.m_pBuf=NULL;elsetemp.m_pBuf=new charnCount+1;for(i=0;iLength()temp.m_pBuf=NULL;elseint nLength=Length()-1;temp.m_pBuf=new charnCount+1;for(i=nLength-1,j=nCount-1;i=(nLength-nCount)i-,j-)temp.m_pBufj=m_pBufi;if(temp.m_pBufj-1!=0)temp.m_pBufnCount=0;return temp;/某个位置开始的几个字符TString TString:Mid(int nPos,int nCount)TString temp;int i,j;if(m_pBuf=NULL)temp.m_pBuf=NULL;else if(nPos=Length()|nCountLength()temp.m_pBuf=NULL;else if(nPos+nCount)Length()temp.m_pBuf=NULL;elseint nLength=Length()-1;temp.m_pBuf=new charnCount+1;for(i=nPos-1,j=0;i(nPos+nCount)i+,j+)temp.m_pBufj=m_pBufi;temp.m_pBufj=0;return temp;/-void main()TString s1=“Hello,“;TString s2=s1;cout“s1=“;s1.Print();cout“n 将 s1 复制到 s2,ns2=“;s2.Print();cout“n 求 s2 的第 3 个字符: “s22endl;TString s3=s1+“world“;cout“n 执行 s3=s1+“world!“之后,ns3=“;s3.Print();s3=s1+s2;cout“n 执行 s3=s1+s2 之后,ns3=“;s3.Print();TString s4;s4+=s1;cout“n 定义 s4:TString s4;执行 s4+=s1 之后,ns4