参考string类完成my_string类
#include <iostream>
#include<cstring>
using namespace std;
class my_string
{
private:char *str;int len;
public://无参构造my_string(){len = 15;str = new char[len];cout<<"无参构造"<<endl;}//有参构造my_string(char *p){len = 15;this->str = new char[len];memset(str,0,15);strcpy(str,p);cout<<"有参构造"<<endl;}//拷贝构造my_string(const my_string &other){len=15;this->str=new char[len];memset(str,0,15);strcpy(str,other.str);}//拷贝赋值my_string &operator=(const my_string &other){if(&other !=this){len=15;this->str=new char[len];memset(str,0,15);strcpy(str,other.str);}}//析构函数~my_string(){delete str;cout<<"析构函数"<<" "<<this<<endl;}void show(){cout<<str<<endl;}//判空bool empty(){if(*str==0){return true;}else{return false;}}//求总长度int size(){int l=0;char *q=str;while(*q!=0){l++;q++;}return l;}//at()char &at(int pos){}//转c风格字符串函数char *c_str(){};
};
int main()
{char * p ="hello" ;my_string s1;my_string s2(p);s2.show();my_string s4(s2);s4.show();my_string s5;s5=s4;s5.show();cout<<s5.size()<<endl;return 0;
}