Question

In Java

The Circle. In one program, write 3 separate functions, and use them.
Calculate area of circle, parameter radius.
Use math lib ‘pow’ function to help with calc: calcArea
Calculate diameter of circle, parameter radius: calcDiameter
Calculate circumference of circle, parameter radius:calcCircumference
Test radius sizes: 5, 42, 12.30

Answer 1

package a1;

import java.util.Scanner;

public class Circle {
    // calcArea method
    public static double calcArea(double radius){
        // Returning area of circle
        return Math.PI*Math.pow(radius,2);
    }

    // calcDiameter method
    public static double calcDiameter(double radius){
        // Returning diameter of circle
        return 2*radius;
    }

    // circumference method
    public static double calcCircumference(double radius){
        // Returning circumference of circle
        return 2*Math.PI*radius;
    }

    // main method
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        
        // Reading radius from user
        System.out.print("Enter radius: ");
        double radius = scan.nextDouble();
        
        // Printing area
        System.out.println("Area of circle = "+calcArea(radius));

        // Printing diameter
        System.out.println("Diameter of circle = "+calcDiameter(radius));

        // Printing circumference
        System.out.println("Circumference of circle = "+calcCircumference(radius));
    }
}