计算机科学论坛--求助

我自己编写cstring类，基本使用字符指针实现，使用了cout ，可以参考一下~~
//*****************CShlString.h

#if _HCSHLSTRING_
#define _HCSHLSTRING_
#endif
class CShlString
{
public:
CShlString();
CShlString(char);
CShlString(char *);
CShlString(char,int);
CShlString(CShlString&);
~CShlString();

void display();              //对应于CString类中的函数
int StringLength();                 //CString::GetLength();
bool StringIsEmpty();               //CString::IsEmpty();
void StringEmpty();                 //CString::Empty();
char FindChar(int);                 //CString::GetAt();
    void StringOverWrite(int,char);     //CString::SetAt();
int StringCompare(char *);          //CString::Compare()
int StringCompare(CShlString);
CShlString StringJoin(char);        //strcat()
CShlString StringJoin(char*);
CShlString StringJoin(CShlString&);
CShlString MidFindChar(int,int);    //CString::Mid();
CShlString RightFindChar(int);      //CString::Right();
int ReverseFindChar(char);          //CString::ReverseFind();
CShlString CharIncluding(CShlString);//CString::SpanIncluding();
CShlString StringCaptical();        //CString::MakeUpper();
CShlString StringLowerCase();       //CString::MakeLower();
void StringReverse();         //CString::MakeReverse();
int StringReplace(char,char);        //CString::Replace();
int StringReplace(char*,char*);
int StringRemove(char);             //CString::Remove();
int StringInsert(int,CShlString);   //CString::Insert();
int StringDelete(int,int);          //CString::Delete();
friend CShlString operator +(CShlString,char);//operator ＋
friend CShlString operator+(CShlString,char *);
CShlString operator+(CShlString&);
CShlString operator=(CShlString&);
CShlString operator+=(CShlString&);// operator +=;
char operator[](int);              // operator [];
private:
char *p;
};

//****************CShlString.cpp

#include "CShlString.h"
#include "iostream.h"

CShlString::CShlString()
{
p=new char[1];
*p='\0';
}
CShlString::CShlString(char ch)
{
p=new char[2];
*p=ch;
*(p+1)='\0';
}
CShlString::CShlString(char *pCh)
{
int i,m=0;
char *pStr;
pStr=pCh;
for(m=0;*pStr;pStr++,m++);
p=new char[m+1];

for(i=0;i<m;i++)
*(p+i)=*(pCh+i);
*(p+i)='\0';

}
CShlString::CShlString(char ch,int nRepeat)
{
p=new char[nRepeat+1];
for(int i=0;i<nRepeat;i++)
  *(p+i)=ch;
*(p+i)='\0';
}
CShlString::CShlString(CShlString& Str)
{
char *pStr;
int m=0;
pStr=Str.p;
for(int i=0;*pStr;i++,pStr++);
pStr=Str.p;
p=new char[i+1];
while(*pStr)
{
  *(p+m)=*pStr;
  pStr++;
  m++;
}
*(p+m)='\0';
}

CShlString::~CShlString()
{
// char *pp;
// pp=p;
// for(int i=0;*pp;i++,pp++);
// if(i!=0)
//
delete []p;

}

void CShlString::display()
{
cout<<p<<endl;
}
int CShlString::StringLength()
{
int m=0;
char *pStr;
pStr=p;
for(m=0;*pStr;pStr++,m++);
return m;
}

bool CShlString::StringIsEmpty()
{
if(*p)
{
  cout<<"This string is not empty!"<<endl;
  return true;
}
cout<<"This string is empty!"<<endl;
return false;
}

void CShlString::StringEmpty()
{
if(*p)
*p='\0';
}
char CShlString::FindChar(int n)
{
char *pCh;
pCh=p;
for(int i=0;*pCh;i++,pCh++);
if(n>i)
{
  cout<<"Wrong number n!"<<endl;
  return '\0';
}
else
  for(int j=0;j<n;j++,pCh++);
return *pCh;
}
void CShlString::StringOverWrite(int m,char ch)
{
char *pp;
pp=p;
for(int i=0;*pp;i++,pp++);
if(m>i)
{
  cout<<"Wrong number n!"<<endl;
  return;
}
else
*(p+m-1)=ch;
}
int CShlString::StringCompare(char* pStr)
{
char *pCh;
int m;
pCh=p;
while (*pCh&&*pStr)
{
  if(*pCh>*pStr)
  {m=1;break;
  }
  else if(*pCh<*pStr)
  {m=-1;break;
  }
  else
  {m=0;pCh++;pStr++;
  }
}
if(*pCh)m=1;
if(*pStr)m=-1;
return m;
}
int CShlString::StringCompare(CShlString Str)
{
char *pCh,*pStr;
CShlString Com_Str;
Com_Str=Str;
pStr=Com_Str.p;
int m;
pCh=p;
while (*pCh&&*pStr)
{
  if(*pCh>*pStr)
  {
   m=1;break;
  }
  else if(*pCh<*pStr)
  {
   m=-1;break;
  }
  else
  {
   m=0;pCh++;pStr++;
  }
}
if(*pCh)m=1;
if(*pStr)m=-1;
return m;
}
CShlString CShlString::StringJoin(char ch)
{
CShlString str;
char *pStr,*pp;
pp=p;
for(int i=0;*pp;i++,pp++);
pStr=new char[i+2];
for(int j=0;j<i;j++)
  *(pStr+j)=*(p+j);
*(pStr+j)=ch;
*(pStr+j+1)='\0';
str.p=pStr;
return str;
}
CShlString CShlString::StringJoin(char* pCh)
{
char *pStr,*pp;
CShlString str;
pp=p;
for(int i=0;*pp;i++,pp++);
for(int n=0;*(pCh+n);n++);
pStr=new char[i+n+2];
for(int j=0;j<i;j++)
  *(pStr+j)=*(p+j);
while (*pCh)
{
  *(pStr+j)=*pCh;
  pCh++;
  j++;
}
*(pStr+j)='\0';
str.p=pStr;
return pStr;
}
CShlString CShlString::StringJoin(CShlString& ch)
{
char *pCh,*pStr,*pp;
CShlString str;
pCh=ch.p;
pp=p;
for(int i=0;*pp;i++,pp++);
for(int n=0;*(pCh+n);n++);
pStr=new char[i+n+2];
for(int j=0;j<i;j++)
  *(pStr+j)=*(p+j);
while(*pCh)
{
  *(pStr+j)=*pCh;
  j++;
  pCh++;
}
*(pStr+j)='\0';
str.p=pStr;
return str;
}
CShlString CShlString::MidFindChar(int mStart,int mLength)
{
char *pCh,*pp;
CShlString Str;
pp=p;
for(int j=0;*pp;j++,pp++);
pCh=new char[j+1];
for(int i=mStart;i<(mStart+mLength);i++)
  *(pCh+i-mStart)=*(p+i-1);
*(pCh+i-mStart)='\0';
Str.p=pCh;
return Str;
}
CShlString CShlString::RightFindChar(int mLength)
{
char *pCh,*pStr;
CShlString Str;
pStr=p;
int i,j=0;
for(i=0;*pStr;i++,pStr++);
pCh=new char[i];
while (mLength)
{
  *(pCh+j)=*(p+i-mLength);
  j++;
  mLength--;
}
*(pCh+j)='\0';
Str.p=pCh;
return Str;

}
int CShlString::ReverseFindChar(char ch)
{
char *pp;
int i,m=-1;
bool flag=false;
pp=p;
for(i=0;*pp;i++,pp++);
pp=p;
while(i)
{
  if(*(pp+i)==ch)
  {
   flag=true;
   break;
  }
  m++;
  // pp++;
  i--;
}
if(flag)
  return m;
else return -1;

}

CShlString CShlString::CharIncluding(CShlString Str)
{
char *pCh,*pp,*pStr;
int i=0;
pStr=Str.p;
pp=p;
for(int j=0;*(p+j);j++);
pCh=new char[j+1];
while(*pp)
{
  pStr=Str.p;
  while(*pStr)
  {
   if(*pStr==*pp||*pStr==(*pp+32)||*pStr==(*pp-32))
   {*(pCh+i)=*pp;
   i++;}
   pStr++;
  }
  pp++;
}

*(pCh+i)='\0';
Str.p=pCh;
return Str;
}
CShlString CShlString::StringCaptical()
{
char *pp,*pCh;
CShlString str;
int i=0;
for(int j=0;*(p+j);j++);
pCh=new char[j+1];
pp=p;
while(*pp)
{
  if(*pp>=97&&*pp<=122)
   *(pCh+i)=*pp-32;
  else *(pCh+i)=*pp;
  pp++;
  i++;
}
*(pCh+i)='\0';
str.p=pCh;
return str;
}
CShlString CShlString::StringLowerCase()
{
char *pCh,*pp;
CShlString str;
int i=0;
for(int j=0;*(p+j);j++);
pCh=new char[j+1];
pp=p;
while(*pp)
{
  if(*pp>=65&&*pp<=90)
   *(pCh+i)=*pp+32;
  else *(pCh+i)=*pp;
  i++;
  pp++;
}
*(pCh+i)='\0';
str.p=pCh;
return str;
}
void CShlString::StringReverse()
{
char *pStr,*pCh;
int i=0,j=0;
pStr=p;
for(i=0;*pStr;i++,pStr++);
pStr=p;
pCh=new char[i+1];
while(i)
{
  *(pCh+j)=*(pStr+i-1);
  j++;
  i--;
}
*(pCh+j)='\0';
delete p;
p=pCh;
}

int CShlString::StringReplace(char ch,char str)
{
int i=0,j,n=0;
char *pp;
pp=p;
for(i=0;*pp;i++,pp++);
for(j=0;j<=i;j++)
{
  if(*(p+j)==ch)
  {
   *(p+j)=str;
   n++;
  }

}
return n;
}
int CShlString::StringReplace(char* pCh,char *pStr)
{
char *pp,*pSave;
int i=0,j=0,NumReturn;
pp=p;
for(int m=0;*(pCh+m);m++);
for(int n=0;*pp;n++,pp++);
for(int k=0;*(pStr+k);k++);
pSave=new char[n+k-m+1];
// CShlString Save;
// pSave=Save.p;
pp=p;
while( i<=n&&j<=m)
{
  if(*(pp+i)==*(pCh+j))
  {
   i++;j++;
  }
  else {i=i-j+1;j=0;
  }
  if(j>=m) break;
}
if(j>=m)
{
  for(int l=0;l<i-m;l++,pp++)
   *(pSave+l)=*pp;
  for(l=i-m;l<(i-m+k);l++,pStr++)
   *(pSave+l)=*pStr;
  for(l=i-m+k;*(pp+m);l++,*pp++)
   *(pSave+l)=*(pp+m);
  *(pSave+l)='\0';
  delete []p;
  p=pSave;
  pp=p;
  for(NumReturn=0;*pp;*pp++,NumReturn++);
  return NumReturn;
}
else return n;
}

int CShlString::StringRemove(char ch)
{
int i=0,j,k,n=0;
char *pp;
pp=p;
for(i=0;*pp;i++,pp++);
pp=p;
for(j=0;j<=i;j++)
{
  if(*(p+j)==ch)
  {
   k=j;
   n++;
   while(k<=i)
   {
    *(p+k)=*(p+k+1);//将p中的ch字符清空。
    k++;
   }
   k=0;
  }
}
return n;
}

int CShlString::StringInsert(int n,CShlString str)
{
char *pp,*pStr,*pCh;
int i,j,k,m=0;
pStr=str.p;
pp=p;
k=str.StringLength();
for(i=0;*pp;i++,pp++);
pp=p;
pCh=new char[i+k+2];
if(i<n)
{
  cout<<"error number n!";
  return i;
}
for(j=0;j<n-1;j++,pp++)
{
  *(pCh+j)=*pp;
  m++;}

for(j=n-1;j<n+k-1;j++)
{
  *(pCh+j)=*(pStr+j-n+1);
  m++;}
for(j=n+k-1;j<k+i;j++,pp++)
{
  *(pCh+j)=*pp;
  m++;}
*(pCh+j)='\0';
delete []p;
p=pCh;
return m;

}
int CShlString::StringDelete(int nStart,int nLength)
{
char *pCh,*pp;
CShlString str;
int m;
str.p=p;
m=str.StringLength();
pp=p;
for(int n=0;*pp;n++,pp++);
pCh=new char[n+1];
if(nStart>n)
{
  cout<<"Wrong Statr number !"<<endl;
  return m;
}
pp=p;
for(int i=0;i<nStart;i++,pp++)
  *(pCh+i)=*pp;
for(i=nStart;i<(nStart+nLength)&&*pp;i++,pp++)
  *(pCh+i)=*(pp+nLength);
while(*pp)
{
  *(pCh+i)=*(pp+nLength);
  pp++;
  i++;
}
*(pCh+i)='\0';
str.p=pCh;
delete p;
p=pCh;
m=str.StringLength();
return m;
}
CShlString operator +(CShlString ch,char str)
{
char *pCh,*pStr,*pp;
CShlString Result;
int i=0;
pCh=ch.p;
for(int m=0;*pCh;m++,pCh++);
pp=new char[m+2];
pStr=&str;
pCh=ch.p;
while(*pCh)
{
  *(pp+i)=*pCh;
  pCh++;
  i++;}
while (*pStr)
{
  *(pp+i)=*pStr;
  pStr++;
  i++;
}
*(pp+i)='\0';
Result.p=pp;
return Result;
}
CShlString CShlString::operator +(CShlString& str)
{
char *pStr,*pCh,*pp;
int i=0;
CShlString Result;
pStr=str.p;
pp=p;
for(int m=0;*(pStr+m);m++);
for(int n=0;*(pp+n);n++);
pCh=new char[m+n+1];
while(*pp)
{
  *(pCh+i)=*(pp);
  i++;
  pp++;
}
while(*pStr)
{
  *(pCh+i)=*(pStr);
  i++;
  pStr++;
}
*(pCh+i)='\0';
Result.p=pCh;
return Result;
}
CShlString operator +(CShlString str,char *pCh)
{
char *pStr,*pp;
int i=0;
CShlString Result;
pStr=str.p;
for(int m=0;*(pStr+m);m++);
for(int n=0;*(pCh+n);n++);
pp=new char[m+n+1];
while(*pStr)
{
  *(pp+i)=*pStr;
  i++;
  pStr++;
}
while(*pCh)
{
  *(pp+i)=*pCh;
  i++;
  pCh++;
}
*(pp+i)='\0';
Result.p=pp;
return Result;

}
CShlString CShlString::operator =(CShlString& str)
{
char *pStr,*pCh;
int i=0;
pStr=str.p;
for(int m=0;*(pStr+m);m++);
pCh=new char[m+1];
while(*pStr)
{
  *(pCh+i)=*pStr;
  i++;
  pStr++;
}
*(pCh+i)='\0';
delete []p;
p=pCh;
//delete []pCh;
return *this;
}
CShlString CShlString::operator+=(CShlString& str)
{
char *pStr,*pCh,*pp;
int i=0;
// CShlString Result;
pStr=str.p;
pp=p;
for(int m=0;*(pp+m);m++);
for(int n=0;*(pStr+n);n++);
pCh=new char[m+n+1];
while(*pp)
{
  *(pCh+i)=*pp;
  i++;
  pp++;
}
while(*pStr)
{
  *(pCh+i)=*pStr;
  pStr++;
  i++;
}
*(pCh+i)='\0';
delete []p;
p=pCh;
return *this;
}
char CShlString::operator [](int n)
{
char *pp,Ch;
pp=p;
for(int i=0;*pp;i++,pp++);
if(n>i)
{
  cout<<"Error number n!";
  return '\0';
}
Ch=*(p+n-1);
return Ch;
}


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