C++
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#include<iostream>
#include<string.h>
#include<fstream>
using namespace std;
class String
{
private:
char *_s;
public:
String(const char* s = "")
{
_s = new char[strlen(s) + 1];
strcpy(_s, s);
}
String(const String &m) //拷贝构造函数
{
_s = new char[strlen(m._s) + 1];
strcpy(_s, m._s);
}
~String()
{
if (_s)
{
delete[] _s;
_s = NULL;
}
}
String &operator=(const String &m) //赋值运算符重载
{
if (this == &m) return *this;
delete _s;
_s = new char[strlen(m._s) + 1];
strcpy(_s, m._s);
return *this;
}
String operator+(const String &m) //+重载
{
String temp;
temp._s = new char[strlen(_s) + strlen(m._s) + 1];
strcpy(temp._s, _s);
strcat(temp._s, m._s);
return temp;
}
friend ostream &operator << (ostream &out, String &m); //<<插入运算符重载(友元)
};
ostream &operator << (ostream &out, String &m)
{
out << m._s << endl;
return out;
}
int main()
{
String p1 = "小明", p2 = "老王",p3;
p3 = p1;
String p4(p2);
String p5 = p1 + p2;
cout << "p1 = "<<p1;
cout << "p2 = "<<p2;
cout << "p3 = p1 :"<< p3;
cout << "p4 = p2 :" << p4;
cout << "p5 = p1 + p2 :"<< p5;
}
#include<string.h>
#include<fstream>
using namespace std;
class String
{
private:
char *_s;
public:
String(const char* s = "")
{
_s = new char[strlen(s) + 1];
strcpy(_s, s);
}
String(const String &m) //拷贝构造函数
{
_s = new char[strlen(m._s) + 1];
strcpy(_s, m._s);
}
~String()
{
if (_s)
{
delete[] _s;
_s = NULL;
}
}
String &operator=(const String &m) //赋值运算符重载
{
if (this == &m) return *this;
delete _s;
_s = new char[strlen(m._s) + 1];
strcpy(_s, m._s);
return *this;
}
String operator+(const String &m) //+重载
{
String temp;
temp._s = new char[strlen(_s) + strlen(m._s) + 1];
strcpy(temp._s, _s);
strcat(temp._s, m._s);
return temp;
}
friend ostream &operator << (ostream &out, String &m); //<<插入运算符重载(友元)
};
ostream &operator << (ostream &out, String &m)
{
out << m._s << endl;
return out;
}
int main()
{
String p1 = "小明", p2 = "老王",p3;
p3 = p1;
String p4(p2);
String p5 = p1 + p2;
cout << "p1 = "<<p1;
cout << "p2 = "<<p2;
cout << "p3 = p1 :"<< p3;
cout << "p4 = p2 :" << p4;
cout << "p5 = p1 + p2 :"<< p5;
}
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