运算符重载
#include <iostream>
#include <string>
using namespace std;
class String
{
public:
String(){p=NULL;}
String(char *str);
friend bool operator>(String &string1,String &string2);
friend bool operator<(String &string1,String &string2);
friend bool operator==(String &string1,String &string2);
void display();
private:
char *p;
};
String::String(char *str)
{
p=str;
}
void String::display()
{
cout<<p;
}
bool operator>(String &string1,String &string2)
{
if(strcmp(string1.p,string2.p)>0)
return true;
else
return false;
}
bool operator<(String &string1,String &string2)
{
if(strcmp(string1.p,string2.p)<0)
return true;
else
return false;
}
bool operator==(String &string1,String &string2)
{
if(strcmp(string1.p,string2.p)==0)
return true;
else
return false;
}
void compare(String &string1,String &string2)
{
if(operator>(string1,string2)==1)
{
string1.display();cout<<">";string2.display();
}
else
if(operator<(string1,string2)==1)
{
string1.display();cout<<"<";string2.display();
}
else
if(operator==(string1,string2)==1)
{
string1.display();cout<<"=";string2.display();
}
cout<<endl;
}
int main()
{
String string1("Hello"),string2("Book"),string3("Computer"),string4("Hello");
compare(string1,string2);
compare(string2,string3);
compare(string1,string4);
return 0;
}