int main() {
// set the radius equal to -1 so we can ensure that
// the user isgiving us valid input
// what was the point of a constructor that has us
// set radius=0?
double radius = -1;
// keeps asking for radius until positive radius is entered
do {
cout << "Please enter a radius: ";
cin >> radius;
} while (radius < 0);
// create a pointer to an instance of a circle
Circle * c = new Circle(radius);
// output the area diameter, and circumference measurements
cout << "The Area of your circle is: " << c->getArea() << endl;
cout << "The Diameter of your circle is: " << c->getDiameter() << endl;
cout << "The Circumference of your circle is: " << c->getCircumference() << endl;
// free up the memory we used for c
// How do we know if we should do this in the main or in the class?
delete [] c;
return 0;
}
/* 三角形一顶点为圆心 */
double getPublicAreaToTriangle (Circle O, Point a, Point b) {
if (sgn((a-O.o)^(b-O.o)) == 0) return 0;
int sig = 1;
double da = getPLength(O.o-a), db = getPLength(O.o-b);
if (sgn(da-db) > 0) {
swap(da, db); swap(a, b); sig = -1;
}
double t1, t2;
vector<Point> sol;
int n = getLineCircleIntersection(a, b, O, t1, t2, sol);
if (sgn(da-O.r*O.r) <= 0) {
if (sgn(db-O.r*O.r) <= 0) return getDirArea(O.o, a, b) * sig;
int k = 0;
if (n == 2 && getPLength(sol[0]-b) > getPLength(sol[1]-b)) k = 1;
double ret = getArea(O.o, a, sol[k]) + O.getArea(getAngle(sol[k]-O.o, b-O.o));
double tmp = (a-O.o)^(b-O.o);
return ret * sig * sgn(tmp);
}
double d = getDistanceToSegment(O.o, a, b);
if (sgn(d-O.r) >= 0) {
double ret = O.getArea(getAngle(a-O.o, b-O.o));
double tmp = (a-O.o)^(b-O.o);
return ret * sig * sgn(tmp);
}
double ret1 = O.getArea(getAngle(a-O.o, b-O.o));
double ret2 = O.getArea(getAngle(sol[0]-O.o, sol[1]-O.o)) - getArea(O.o, sol[0], sol[1]);
double ret = (ret1 - ret2), tmp = (a-O.o)^(b-O.o);
return ret * sig * sgn(tmp);
}
void main()
{
Circle c;
c.setPoint(1, 1);
c.getArea();
c.setPoint(5, 5);
c.setRadius(6);
c.setRadius(3);
cout << c.getArea() << endl;
}
double getPublicAreaCircleToCircle(Circle a, Circle b) {
double dis = getLength(a.o - b.o);
if (dcmp(dis-a.r-b.r) >= 0) return 0;
if (dis <= fabs(a.r - b.r)) { return min(a.getArea(2*pi), b.getArea(2*pi)); }
double ang1 = getAngle(a.r, dis, b.r);
double ang2 = getAngle(b.r, dis, a.r);
double ret = ang1 * a.r * a.r + ang2 * b.r * b.r - dis * a.r * sin(ang1);
return ret;
}
void UseVector::printVector() {
vector<Shape*>::iterator vectorIterator;
Circle *circleElement;
Rectangle *rectangleElement;
Triangle *triangleElement;
for (vectorIterator = shapeVector->begin(); vectorIterator < shapeVector->end(); vectorIterator++) {
if ((*vectorIterator)->getShapeType() == "Circle") {
circleElement = dynamic_cast<Circle*>((*vectorIterator));
cout << "The circle has a area of " << (*vectorIterator)->getArea() << endl;;
cout << "The circleElement has an area of " << circleElement->getArea() << endl;
this->printElement(circleElement);
} else if ((*vectorIterator)->getShapeType() == "Rectangle") {
rectangleElement = dynamic_cast<Rectangle*>((*vectorIterator));
cout << "The rectangle has a area of " << (*vectorIterator)->getArea() << endl;
cout << "The rectangleElement has an area of " << rectangleElement->getArea() << endl;
this->printElement(rectangleElement);
} else if ((*vectorIterator)->getShapeType() == "Triangle") {
triangleElement = dynamic_cast<Triangle*>((*vectorIterator));
cout << "The triangle has a area of " << (*vectorIterator)->getArea() << endl;
cout << "The triangleElement has an area of " << triangleElement->getArea() << endl;
this->printElement(triangleElement);
}
}
}
int main() {
Circle circle;
double radius;
cout<<"enter the circle's radius: ";
cin>>radius;
circle.setRadius(radius);
cout<<"the circle's area is "<<circle.getArea()<<endl;
cout<<"the circle's diameter is "<<circle.getDiameter()<<endl;
cout<<"the circle's circumference is "<<circle.getCircumference()<<endl;
return 0;
}
int main(int argc, char** argv) {
float rad;
Circle info;
//input
cout<<"Input the radius"<<endl;
cin>>rad;
info.setRadius(rad);
cout<<"Circle Information\n";
cout<<"Area: "<<info.getArea(rad,PI)<<endl;
cout<<"Diameter: "<<info.getDiameter(rad)<<endl;
cout<<"Circumference: "<<info.getCircum(rad,PI)<<endl;
return 0;
}
/*
* The Circle main thread
*/
int main(int argc, char** argv) {
double radius;
cout << "Please enter the radius of a circle: ";
cin >> radius;
Circle* circle = new Circle(radius);
cout << "The area of this circle is: " << circle->getArea() << endl;
cout << "The diameter of this circle is: " << circle->getDiameter() << endl;
cout << "The circumference of this circle is: " << circle->getCircumference() << endl;
return 0;
}
int main()
{
Circle dayra;
string CircleColor = "blue" ;
dayra.setColor(CircleColor);
cout<< dayra.getColor()<<" "<< dayra.isfilled()<<" before set "<< "\n";
dayra.setfilled() ;
cout<< dayra.isfilled()<<"\n" ;
dayra.setRadius(5);
Rectangle mostatel;
mostatel.setWidth(5);
mostatel.setLength(5);
mostatel.setColor(CircleColor);
cout << dayra.getArea()<< " area "<<mostatel.getArea() << "\n" ;
cout << dayra.getPerimeter() << " prmtr " << mostatel.getPerimeter() << "\n" ;
dayra.toString();
cout << "\n" ;
mostatel.toString() ;
return 0;
}
//Copy Constructor
Circle :: Circle(const Circle &rhs){
radius = rhs.getRadius();
Area = rhs.getArea();
X = rhs.getX();
Y = rhs.getY();
}
void printCircle(Circle &c) {
cout << "The area of the circle of " <<
c.getRadius() << " is " << c.getArea() << endl;
}