Question

Write a program to calculate the area of a circle as follows:

Assign the circle radius.

Compute the area using this formula: area = radius X radius X  3.14159

Display the area.

Below is a sample output if how the output should look:

The area for the circle of radius 10.0 is 314.159

Answer 1

public class AreaOfCircle {
    public static void main(String[] args) {
        // Assign the circle radius.
        double radius = 10.0;

        // Compute the area using this formula: area = radius X radius X  3.14159
        double area = radius*radius*3.14159;

        // Display the area.
        System.out.println("The area for the circle of radius "+radius+" is "+area);
    }
}