# include <iostream>
using namespace std;
 
class circle
{
public:
 
    void setRadius (double r)
    {
[COLOR="Red"][B]-[/B][/COLOR]      radius = r; [COLOR="Green"] //here the problem and i don't know why it's keep telling me " undeclared identifier "[/COLOR]
    }
 
    double getRadius()
    {
        return radius;
    }
 
 
    double getdiameter()
    {
        return 2 * radius;
    }
 
 
    double getarea()
    {
        return 3.14 * radius * radius;
    }
 
 
    double getcircumference()
    {
        return 3.14 * radius * 2;
    }
 
 
private:
 
double raduis;
 
};
 
 
 
int main()
{
    circle candenter;
 
 
    candenter.setRadius (1.5);
 
 
    cout << "Please enter the radius" << candenter.getRadius() << endl;
 
 
    cout << "Circle information using function members:\n" << endl;
 
    cout << "Diameter is " << candenter.getdiameter() << endl;
 
    cout << "Circumference is " << candenter.getcircumference() << endl;
 
    cout << "Area is \n" << candenter.getarea() << endl;
 
 
    cout << "Circle informationusing display function:\n" << endl;
 
 
 
return 0;
 
}