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2.3 Constants

  1. Add the following line to the Circle class (above the other attributes): 

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    private const double LimitValueForBigShape = 100.0;

    Your attributes should look like this:

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    private const double LimitValueForBigShape = 100.0;
private double _radius;
private double _centerX;
private double _centerY;
private string _color;

    const means the variable can no longer be changed and is therefore a constant. In C#, const is implicitly static (equivalent to Java's static final), so the constant is shared by all instances of the class. Per C# coding conventions, constants use PascalCase (not SCREAMING_CAPS as in Java).

  2. Add the following method to the Circle class:

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    public string DescribeSize()
{
    if (CalculateArea() > LimitValueForBigShape)
    return "I am big!!!";
    else
    return "I am small!!!";
}

  3. Modify the Main method as follows:

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    static void Main(string[] args)
{
    Circle myDefaultCircle = new Circle();
    Console.WriteLine(myDefaultCircle.Radius);
    Console.WriteLine(myDefaultCircle.CalculateArea());
    Console.WriteLine(myDefaultCircle.DescribeSize());
    myDefaultCircle.Radius = 3;
    Console.WriteLine(myDefaultCircle.CalculateArea());
    Console.WriteLine(myDefaultCircle.DescribeSize());
    myDefaultCircle.Radius = 6;
    Console.WriteLine(myDefaultCircle.CalculateArea());
    Console.WriteLine(myDefaultCircle.DescribeSize());
}

  4. Run your program. Your output will look like this:

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3.141592653589793
I am small!!!
28.274333882308138
I am small!!!
113.09733552923255
I am big!!!

  5. Try some other values and view the output.