import std.stdio;
// Base class
class Shape {
public:
void setWidth(int w) {
width = w;
}
void setHeight(int h) {
height = h;
}
protected:
int width;
int height;
}
// Derived class
class Rectangle: Shape {
public:
int getArea() {
return (width * height);
}
}
class Square: Rectangle {
this(int side) {
this.setWidth(side);
this.setHeight(side);
}
}
void main() {
Square square = new Square(13);
// Print the area of the object.
writeln("Total area: ", square.getArea());
}
原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/tech/pnotes/266061.html