Machine Problem
Write a program that input from the user the radius of a circle as an integer and prints the circle's circumference and area using the predefined constant Math.PI.
Use the following formulas (r is the radius):
circumference = 2 PI r
area = PI r 2
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/* Write a program that input from the user the radius of a circle
as an integer and prints the circle's circumference and area
using the predefined constant Math.PI.
Use the following formulas (r is the radius):
circumference = 2 PI r
area = PI r 2
*
*/
import javax.swing.JOptionPane;
import java.text.DecimalFormat;
import java.lang.Math;
public class Area_Circle {
private static final DecimalFormat df = new DecimalFormat("0.00");
public static void main(String[] args) {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
String r =
JOptionPane.showInputDialog( "Enter the radius of the circle: " );
double radius = Double.parseDouble(r);
//Area = PI*radius*radius
double area=(Math.PI*(radius*radius));
//Circumference = 2*PI*radius
double circumference= Math.PI * 2*radius;
JOptionPane.showMessageDialog( null, "The Area of the Circle : " + df.format(area) + "\n"
+ "The Circumference of the Circle : " + df.format(circumference)
, "The Result", JOptionPane.INFORMATION_MESSAGE );
}
}