в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

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2010-05-25T10:28:23Z

1 версия: Импорт контента...

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==Add a friend extractor for objects of type MyClass.==

<source lang="cpp">
#include <iostream>
using namespace std;
class MyClass {
int x, y;
public:
MyClass() {
x = 0;
y = 0;
}
MyClass(int i, int j) {
x = i;
y = j;
}
friend ostream &operator<<(ostream &stream, MyClass ob);
friend istream &operator>>(istream &stream, MyClass &ob);
};
ostream &operator<<(ostream &stream, MyClass ob)
{
stream << ob.x << ", " << ob.y << "\n";
return stream;
}
istream &operator>>(istream &stream, MyClass &ob)
{
cout << "Enter MyClassinates: ";
stream >> ob.x >> ob.y;
return stream;
}
int main()
{
MyClass a(1, 1), b(10, 23);
cout << a << b;
cin >> a;
cout << a;
return 0;
}

</source>

==Overload << and >>==

>" src="http://www.java2s.com/Code/CppImages/Overloadand.PNG">

<source lang="cpp">
#include <iostream>
using namespace std;
class MyClass {
int x, y;
public:
MyClass() {
x=0;
y=0;
}
MyClass(int i, int j) {
x=i;
y=j;
}
void getXY(int &i, int &j) {
i=x;
j=y;
}
MyClass operator<<(int i);
MyClass operator>>(int i);
};
// Overload <<.
MyClass MyClass::operator<<(int i)
{
MyClass temp;
temp.x = x << i;
temp.y = y << i;
return temp;
}
// Overload >>.
MyClass MyClass::operator>>(int i)
{
MyClass temp;
temp.x = x >> i;
temp.y = y >> i;
return temp;
}
int main()
{
MyClass object1(4, 4), object2;
int x, y;

object2 = object1 << 2; // ob << int
object2.getXY(x, y);
cout << "(object1<<2) X: " << x << ", Y: " << y << endl;
object2 = object1 >> 2; // ob >> int
object2.getXY(x, y);
cout << "(object1>>2) X: " << x << ", Y: " << y << endl;
return 0;
}

</source>

==PhoneNumber extractor==

<source lang="cpp">
#include <iostream>
#include <cstring>
using namespace std;
class PhoneNumber {
char name[80];
int areaCode;
int prefix;
int num;
public:
PhoneNumber() { };
PhoneNumber(char *n, int a, int p, int nm)
{
strcpy(name, n);
areaCode = a;
prefix = p;
num = nm;
}
friend ostream &operator<<(ostream &stream, PhoneNumber o);
friend istream &operator>>(istream &stream, PhoneNumber &o);
};
ostream &operator<<(ostream &stream, PhoneNumber o)
{
stream << o.name << " ";
stream << "(" << o.areaCode << ") ";
stream << o.prefix << "-" << o.num << "\n";
return stream; // must return stream
}
istream &operator>>(istream &stream, PhoneNumber &o)
{
cout << "Enter name: ";
stream >> o.name;
cout << "Enter area code: ";
stream >> o.areaCode;
cout << "Enter prefix: ";
stream >> o.prefix;
cout << "Enter number: ";
stream >> o.num;
cout << "\n";
return stream;
}
int main()
{
PhoneNumber a;
cin >> a;
cout << a;
return 0;
}

</source>

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C++/Overload/Extractor - История изменений

в 14:21, 25 мая 2010

Admin: 1 версия: Импорт контента...