2024.9.2 作业

完成mystring类部分功能实现

代码：

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

文件名：work4.h

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

#ifndef WORK4_H
#define WORK4_H
#include 
#include
using namespace std;
class Mystring
{
private:
    char *buf;
public:
    static int count;
public:
    Mystring()
    {
        buf = new char[1];
        *buf = '\0';
        count++;
    }
    Mystring(const char *b);
    ~Mystring()
    {
        delete[] buf;
        count--;
    }
    void show()
    {
        cout<(const Mystring &R);
    bool operator>=(const Mystring &R);
    bool operator<=(const Mystring &R);
    friend ostream & operator<<(ostream &L, const Mystring &R);
    friend istream & operator>>(istream &L, Mystring &R);
};

#endif // WORK4_H

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

文件名：work4.cpp

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

#include"work4.h"
int Mystring::count = 0;
Mystring::Mystring(const char *b)
{
    int len=strlen(b);
    this->buf = new char[len + 1];
    strcpy(this->buf, b);
    count++;
}
const Mystring &Mystring::operator=(const Mystring &R)
{
    delete[] buf;
    buf = new char[std::strlen(R.buf) + 1];
    std::strcpy(buf, R.buf);
    return *this;
}
char Mystring::at(int index)
{
    if (index < 0 || index >= (int)strlen(buf)) {
        throw std::out_of_range("Index out of range");
    }
    return this->buf[index];
}
const Mystring Mystring::operator[](int index)
{
    return Mystring(&buf[index]);
}
char Mystring::data()
{
    return *this->buf;
}
const Mystring Mystring::c_str()
{
    return *this;
}
bool Mystring::empty()
{
    return "this->buf=='\0'";
}
int Mystring::size()const
{
    return strlen(this->buf);
}
int Mystring::length()const
{
    return size();
}
int Mystring::capacity()const
{
    return strlen(this->buf)+1;
}
bool Mystring::clear()
{
    delete[]this->buf;
    this->buf=new char[1];
    *buf='\0';
    return 1;
}
bool Mystring::push_back(char s)
{
    char *newBuf = new char[capacity() + 1];
    std::strcpy(newBuf, this->buf);
    newBuf[size()] = s;
    newBuf[size() + 1] = '\0';
    delete[] this->buf;
    buf = newBuf;
    return 1;
}
bool Mystring::pop_balck()
{
    if (empty())
    {
        return 0;
    }
    char *newBuf = new char[size() + 1];
    std::strncpy(newBuf, this->buf, size() - 1);
    newBuf[size() - 1] = '\0';
    delete[] this->buf;
    buf = newBuf;
    return 1;
}
bool Mystring::append(char s)
{
    return push_back(s);
}
Mystring &Mystring::operator+=(const Mystring &R)
{
    *this = *this + R;
    return *this;
}
const Mystring Mystring::operator+(const Mystring &R)
{
    Mystring temp;
    temp.buf = new char[size() + R.size() + 1];
    strcpy(temp.buf, buf);
    strcat(temp.buf, R.buf);
    return temp;
}
bool Mystring::operator==(const Mystring &R)
{
    return strcmp(buf, R.buf) == 0;
}
bool Mystring::operator!=(const Mystring &R)
{
    return !(*this == R);
}
bool Mystring::operator>(const Mystring &R)
{
    return strcmp(this->buf, R.buf) > 0;
}
bool Mystring::operator>=(const Mystring &R)
{
    return *this > R || *this == R;
}
bool Mystring::operator<=(const Mystring &R)
{
    return !(*this > R);
}
ostream & operator<<(ostream &L, const Mystring &R)
{
    L << R.buf;
    return L;
}
istream & operator>>(istream &L, Mystring &R)
{
    L>>R.buf;
    return L;
}

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

文件名：main.cpp

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

#include"work4.h"

int main()
{
    Mystring s1="hello";
    s1.show();
    Mystring s2="world!";
    s2.show();
    Mystring s3=s1+s2;
    s3.show();
    cout<>s5;
    cout<=s3)<

结果：

思维导图：