#include<iostream.h>
#include<stdlib.h>
#include<string.h>
#include"stringclass.h"
String::String(const char *c)//缺省构造函数的实现
{
size=strlen(c);
str=new char[size+1];
if(str==NULL)
Error("String:overflow!");
strcpy(str,c);
}
String::String(const String& cs)//拷贝构造函数的实现
{
size=cs.size;
str=new char[size+1];
if(str==NULL)
Error("String:overflow!");
strcpy(str,cs.str);
}
//类串的输入输出
istream& operator>>(istream& istr,String& cs)
{
char tmp[256];
istr>>tmp;
cs=tmp;
return(istr);
}
ostream& operator<<(ostream& ostr,const String& cs)
{
ostr<<cs.str;
return(ostr);
}
int String::ReadString(istream& istr,char delimiter)
{
char tmp[256];
if(istr.getline(tmp,256,delimiter))
{
*this=tmp;
return(size);
}
else
return(-1);
}
//赋值运算符
String& String::operator=(const String& cs)//类串=类串
{
if(size!=cs.size)
{
delete[]str;
size=cs.size;
str=new char[size+1];
if(str==NULL)
Error("operator=:overflow!");
}
strcpy(str,cs.str);
return(*this);
}
String& String::operator=(const char *c) //类串=C串
{
int n=strlen(c);
if(size!=n)
{
delete[]str;
size=n;
str=new char[size+1];
if(str==NULL)
Error("operator=:overflow!");
}
strcpy(str,c);
return(*this);
}
//成员转换函数
String::operator char*(void)const
{
return(str);
}
//串连接运算符
String String::operator+(const String& cs)const
{
String w;
delete[]w.str;
w.size=size+cs.size;
w.str=new char[w.size+1];
if(w.str==NULL)
Error("operator+:overflow!");
strcpy(w.str,str);
strcat(w.str,cs.str);
return(w);
}
String String::operator+(const char *c)const//String+C++String
{
String w;
delete[]w.str;
w.size=size+strlen(c);
w.str=new char[w.size+1];
if(w.str==NULL)
Error("operator+:overflow!");
strcpy(w.str,str);
strcat(w.str,c);
return(w);
}
String operator+(const char *c,const String& cs)//C++String+String
{
String w;//不能简化为return(cs+c),因为连接后的串顺序不对
delete[]w.str;
w.size=strlen(c)+cs.size;
w.str=new char[w.size+1];
if(w.str==NULL) //友元不能调用私有函数Error
{
cerr<<"operator+:overflow!";
exit(1);
}
strcpy(w.str,c);
strcat(w.str,cs.str);
return(w);
}
String& String::operator+=(const String& cs)//String+String
{
char *tmp=new char[size+1];
if(tmp==NULL)
Error("operator+=:overflow!");
strcpy(tmp,str);
delete[]str;
size=size+cs.size;
str=new char[size+1];
if(str==NULL)
Error("operator+=:overflow!");
strcpy(str,tmp);
strcat(str,cs.str);
delete tmp;
return(*this);
}
String& String::operator+=(const char *c)
{
char *tmp=new char[size+1];
if(tmp==NULL)
Error("operator+=:overflow!");
strcpy(tmp,str);
delete[]str;
size=size+strlen(c);
str=new char[size+1];
if(str==NULL)
Error("operator+=:overflow!");
strcpy(str,tmp);
strcat(str,c);
delete tmp;
return(*this);
}
String String::SubString(int id,int count)const
{
String cs;
if(id<0)
Error("SubString:id illegal!");
if(id>size-1||count<=0)
count=0;
int left=size-id;
if(left>0&&count>left)
count=left;
delete[]cs.str;
cs.size=count;
cs.str=new char[cs.size+1];
if(cs.str==NULL)
Error("SubString:overflow!");
char* p=cs.str;
char* q=str+id;
for(int i=1;i<=count;i++)
*p++=*q++;
*p='\0';
return(cs);
}
String& String::Insert(const char *c,int id)
{
if(id<0||id>size)
Error("Insert:id illegal!");
char* temp=new char[size+1];
if(temp==NULL)
Error("Insert:overflow!");
strcpy(temp,str);
delete[]str;
int n=size+strlen(c); //新串长
str=new char[n+1];
if(str==NULL)
Error("Insert:overflow!");
strcpy(str,temp);
delete[]temp;
char* p=str+size;
char* q=str+n;
int left=size-id+1; //包括串结束符
for(int i=1;i<=left;i++)
*q--=*p--;
p=str+id;
i=0;
while(*(c+i)!='\0')//c是const指针
*p++=*(c+i++);
size=n;
return(*this);
}
String& String::Insert(const String& cs,int id)
{
if(id<0||id>size)
Error("Insert:id illegal!");
char* temp=new char[size+1];
if(temp==NULL)
Error("Insert:overflow!");
strcpy(temp,str);
delete[]str;
int n=size+cs.size;
str=new char[n+1];
if(str==NULL)
Error("Insert:overflow!");
strcpy(str,temp);
delete[]temp;
char* p=str+size;
char* q=str+n;
int left=size-id+1; //需要移动的字符数，包括串结束符
for(int i=1;i<=left;i++)
*q--=*p--;
p=str+id;
q=cs.str;
while(*q!='\0')
*p++=*q++;
size=n;
return (*this);
}
void String::Erase(int id,int count)
{
if(id>size-1||count<=0)
return;
if(id<0)
Error("Delete:id illegal!");
int left=size-id;
if(count>left)
count=left;
char* p=str+id;
char* q=str+id+count;
while(*q!='\0')
*p++=*q++;
*p='\0';
size=strlen(str);
char* tmp=new char[size+1];
if(tmp==NULL)
Error("Delete :overflow!");
strcpy(tmp,str);
delete[]str;
str=new char[size+1];
if(str==NULL)
Error("Delete :overflow!");
strcpy(str,tmp);
delete[]tmp;
}
char& String::operator[](int id)
{
if(id<0||id>size-1)
Error("operator[]:Id illegal!");
return(*(str+id)); //return(str[id]);
}
const char& String::operator[](int id)const
{
if(id<0||id>size-1)
Error("operator[]:Id illegal!");
return(*(str+id)); //return(str[id]);
}
int String::Find(char ch,int start)const
{
int i; char *p;
if(start>size-1)
return(-1);
if(start<0)
start=0;
for(p=str+start,i=start;*p!='\0';++p,++i)
if(*p==ch)
return(i);
return(-1);
}
int String::FindLast(char ch)const
{
int i;
char *p;
for(p=str+size-1,i=size-1;p!=str;--p,--i)
if(*p==ch)
return(i);
return(-1);
}
data_structs.rar_Data structs_structs （303个子文件） 
stringclass.cpp 6KB stringclass.cpp 5KB stringclass.cpp 5KB stringclass.cpp 5KB stringclass.cpp 5KB stringclass.cpp 5KB stringclass.cpp 5KB stringclass.cpp 5KB simulation.cpp 4KB str.cpp 4KB str.cpp 4KB Program.cpp 3KB Date.cpp 3KB Date.cpp 3KB Date.cpp 3KB date.cpp 3KB date.cpp 3KB DATE.CPP 3KB Program.cpp 2KB Program.cpp 2KB program.cpp 2KB program.cpp 2KB PersonLib.cpp 2KB SPOOLER.CPP 2KB Person.cpp 1KB Person.cpp 1KB Person.cpp 1KB program.cpp 1KB PROGRAM.CPP 1KB queue.cpp 1KB program.cpp 1KB program.cpp 995B 人事管理应用程序.cpp 995B Main.cpp 957B program.cpp 956B Program.cpp 923B main.cpp 897B customdate.cpp 788B program.cpp 640B Program.cpp 604B Program.cpp 602B program.cpp 582B program.cpp 573B Program.cpp 521B Contractor.cpp 512B program.cpp 507B contractor.cpp 500B Program.cpp 464B SSN.CPP 434B Ssn.cpp 434B SSN.CPP 434B Ssn.cpp 434B Program.cpp 420B program.cpp 413B Money.cpp 393B Money.cpp 391B MONEY.CPP 391B program.cpp 360B SalariedEmployee.cpp 356B WagedEmployee.cpp 345B program.cpp 344B program.cpp 332B program.cpp 317B Employee.cpp 287B date.cpp 234B program.cpp 210B PROGRAM.CPP 114B main.cpp 113B 一个人事管理类库的设计.dsp 6KB Contractor类的应用程序.dsp 5KB Person类的应用示范程序.dsp 5KB 用户类型之间的转换.dsp 5KB 事件驱动模拟.dsp 5KB 打印缓冲池.dsp 5KB 继承.dsp 5KB 类模板.dsp 4KB 中缀表达式求值.dsp 4KB 单向结点结构示范程序.dsp 4KB 类串示范程序.dsp 4KB 顺序表类示范程序.dsp 4KB 顺序队列示范程序.dsp 4KB 社会安全号.dsp 4KB 模式匹配.dsp 4KB 顺序表示范程序.dsp 4KB 顺序栈示范程序.dsp 4KB 模式匹配.dsp 4KB 删除重复数据.dsp 4KB 结构串.dsp 4KB MONEY.DSP 4KB 纯虚函数和抽象类.dsp 4KB Date.dsp 4KB 循环链表.dsp 4KB 基数排序.dsp 4KB 数制转换.dsp 4KB vector.dsp 4KB 回文.dsp 4KB 逆置.dsp 4KB List.dsp 4KB Contractor类的应用程序.dsw 569B 一个人事管理类库的设计.dsw 569B共 303 条
- 1
- 2
- 3
- 4
资源评论
