Example: How to Find Area of a Circle with Diameter in Java

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// How to Find Area of a Circle with Diameter in Java
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
    	Scanner in = new Scanner(System.in);
        System.out.println("Enter the radius of the circle::\n");

        float r = in.nextFloat();
        float d;
        float c;
        float a;
        // r = radius, d = diameter, c = circumference, a = area

        // It will calculate the diameter, circumference, and area
	    d = 2 * r;
	    c = 2 * (float)3.14 * r;
	    a = (float)3.14 * (r * r);

        System.out.println("\nDiameter      = " + d + " units");
        System.out.println("Circumference = " + c + " units");
        System.out.println("Area          = " + a + " sq. units");
    }
}