自行实现一个Mystring类
#include <iostream>
#include <cstring>
using namespace std;
class mystring
{
public:
mystring()
{
len = 0;
str = nullptr;
}
mystring(const char* s)
{
len = strlen(s);
str = new char[len + 1];
strcpy(str, s);
}
mystring(const mystring& other)
{
len = other.len;
str = new char[len + 1];
strcpy(str, other.str);
}
~mystring()
{
delete[] str;
}
mystring& operator=(const mystring& other)
{
if (this != &other)
{
len = other.len;
delete[] str;
str = new char[len + 1];
strcpy(str, other.str);
}
return *this;
}
const char* data() const
{
return str;
}
bool empty() const
{
return len == 0;
}
int size() const
{
return len;
}
int length() const
{
return len;
}
char at(int index) const
{
if (index < 0 || index >= len)
{
throw out_of_range("Index out of range");
}
return str[index];
}
private:
char* str;
int len;
};
int main()
{
mystring s1("hello");
mystring s2(s1);
cout << s1.data() << endl;
cout << s2.data() << endl;
s2 = mystring("world");
cout << s1.data() << endl;
cout << s2.data() << endl;
cout << s1.size() << endl;
cout << s2.size() << endl;
cout << s1.empty() << endl;
cout << s2.empty() << endl;
cout << s1.length() << endl;
cout << s2.length() << endl;
try {
cout << s1.at(0) << endl;
cout << s2.at(0) << endl;
} catch (const out_of_range& e) {
cerr << e.what() << endl;
}
return 0;
}
标签:const,2024.9,作业,len,char,other,C++,str,mystring
From: https://blog.csdn.net/qq_63490254/article/details/141828325