C++ day4

1、仿照string类，完成myString 类

#include 

#include 

using namespace std;

class myString

{

private:

    char *str;  //记录c风格的字符串

    int size;   //记录字符串的实际长度

public:

    //无参构造

    myString():size(10)

    {

        str = new char[size];   //构造出一个长度为10的字符串

        strcpy(str, "");    //赋值为空

    }

    //有参构造

    myString(const char *s)

    {

        size = strlen(s);

        str = new char[size+1];

        strcpy(str, s);

    }

    //拷贝构造函数

    myString(const myString &other):str(new char(*(other.str))),size(other.size)

    {

        strcpy(this->str,other.str);    //拷贝字符串

        this->size = other.size;    //拷贝字符串长度

        cout<<"myString::拷贝构造函数 str = "< 
  
        }
 
  
        return *(str+pos);
 
  
    }
 
  
};
 
  
 
  
int main()
 
  
{
 
  
    myString s1("hello world");
 
  
 
  
    myString s2(s1);
 
  
 
  
    myString s3;
 
  
    s3 = s2;
 
  
    cout << "字符串长度为：" < 
  
 
  
    cout<<"at(1) = "< 
  
 
  
    cout<<"c_str: "< 
  
 
  
 
  
    return 0;
 
  
}
 
  
 
  
2、思维导图