в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

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2010-05-25T10:28:25Z

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==Another Demo: Overload the == and && relative to MyClass class.==

<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;
}
int operator==(MyClass object2);
int operator&&(MyClass object2);
};
// Overload the == operator for MyClass.
int MyClass::operator==(MyClass object2)
{
return x==object2.x && y==object2.y;
}
// Overload the && operator for MyClass.
int MyClass::operator&&(MyClass object2)
{
return (x && object2.x) && (y && object2.y);
}

int main()
{
MyClass object1(10, 10), object2(5, 3), object3(10, 10), object4(0, 0);
if(object1==object2)
cout << "object1 same as object2\n";
else
cout << "object1 and object2 differ\n";
if(object1==object3)
cout << "object1 same as object3\n";
else
cout << "object1 and object3 differ\n";
if(object1 && object2)
cout << "object1 && object2 is true\n";
else
cout << "object1 && object2 is false\n";
if(object1 && object4)
cout << "object1 && object4 is true\n";
else
cout << "object1 && object4 is false\n";
return 0;
}

</source>

==Operator Overloading: Overload the +, =,==

<source lang="cpp">
#include <iostream>
using namespace std;
class three_d {
int x, y, z;
public:
three_d operator+(three_d t);
three_d operator=(three_d t);

void show(void) ;
void assign(int mx, int my, int mz);
} ;

// Overload the +.
three_d three_d::operator+(three_d t)
{
three_d temp;

temp.x = x+t.x;
temp.y = y+t.y;
temp.z = z+t.z;
return temp;
}

// Overload the =.
three_d three_d::operator=(three_d t)
{
x = t.x;
y = t.y;
z = t.z;
return *this;
}

// show X, Y, Z coordinates
void three_d::show(void)
{
cout << x << ", ";
cout << y << ", ";
cout << z << "\n";
}

// Assign coordinates
void three_d::assign(int mx, int my, int mz)
{
x = mx;
y = my;
z = mz;
}

main(void)
{
three_d a, b, c;

a.assign(1, 2, 3);
b.assign(10, 10, 10);

a.show();
b.show();

c = a+b;
c.show();

c = a+b+c;
c.show();

c = b = a;
c.show();
b.show();

return 0;
}

</source>

==overloaded "+=" assignment operator==

<source lang="cpp">
#include <iostream>
using namespace std;
class Distance{
private:
int feet;
float inches;
public:
Distance() : feet(0), inches(0.0){ }
Distance(int ft, float in) : feet(ft), inches(in){ }
void getdist(){
cout << "\nEnter feet: "; cin >> feet;
cout << "Enter inches: "; cin >> inches;
}
void showdist() const{
cout << feet << "\"-" << inches << "\"";
}
void operator += ( Distance );
};
void Distance::operator += (Distance d2){
feet += d2.feet;
inches += d2.inches;
if(inches >= 12.0)
{
inches -= 12.0;
feet++;
}
}
int main(){
Distance dist1;
dist1.getdist();
cout << "\ndist1 = "; dist1.showdist();
Distance dist2(11, 6.25);
cout << "\ndist2 = "; dist2.showdist();
dist1 += dist2;
cout << "\nAfter addition,";
cout << "\ndist1 = "; dist1.showdist();
cout << endl;
return 0;
}

</source>

==overloads assignment operator (=)==

<source lang="cpp">
#include <iostream>
using namespace std;
class alpha {
private:
int data;
public:
alpha(){ }
alpha(int d){ data = d; }
void display(){ cout << data; }
alpha operator = (alpha& a){
data = a.data;
cout << "\nAssignment operator invoked";
return alpha(data);
}
};
int main(){
alpha a1(37);
alpha a2;
a2 = a1;
cout << "\na2=";
a2.display();
alpha a3 = a2;
cout << "\na3=";
a3.display();
cout << endl;
return 0;
}

</source>

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C++/Overload/Assign - История изменений

в 14:21, 25 мая 2010

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