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- #include <iostream>
- using namespace std;
- struct Point
- {
- int x;
- int y;
- };
- class Circle
- {
- static const double PI = 3.14159;
- double _radius;
- public:
- //það þarf ekki að decleara, eða hvernig sem maður skrifar það, föllin
- //fyrst. bara býrð þau til þarna fyrir neðan
- double getRadius(void);
- double area(double);
- double perimeter(void);
- double setRadius(void);
- Circle()
- {
- _radius = 1.0;
- }
- Circle(double r)
- {
- if (r > 100)
- {
- //kasta villu
- }
- _radius = r;
- }
- //það á ekkert að vera inn í () í föllunum fyrir neðan nema bara í setRadius
- //fallinu
- double getRadius(void) const
- {
- return _radius;
- }
- double area(double r) const
- {
- double a = (PI * r) / 2;
- return a;
- }
- double perimeter(double r) const
- {
- double p = 2 * PI * r;
- return p;
- }
- double setRadius(double r) const
- {
- r = _radius;
- return r;
- }
- };
- void circleInfo(Circle& circle) {
- cout << "Area: " << circle.area() << endl;
- cout << "Perimeter: " << circle.perimeter() << endl;
- }
- int main()
- {
- double radius;
- cout << "Radius of circle: ";
- cin >> radius;
- Circle circle(radius);
- circleInfo(circle);
- circle.setRadius(circle.getRadius() + 1.0);
- circleInfo(circle);
- return 0;
- }
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