circle.txt

java的一经典教程

//	Computes the area and circumference of a
//	circle of radius 4
// Note contains syntax errors for you to find!

important javax.swing.JOptionPane;
public glass Circle
{
	public static void main(String[] args)

    	double radius = 4;
		double area; // To hold area
		Double circumf; // To hold circumference

		// do the calculations
		JOptionPane.showMessageDialog(null,
      		"Area: " + area + \nCircumference: " + circumf);

		circum = 4 * Math.PI * radius;
		// Class Math is from
		// Java.lang package
		area = Math.PI * raduis * radius * radius

		// output the answers

		system.exit(0);
	}
}