Defining static Constants

In this problem, you will create a program that defines mathematical constants PI and E as static final fields in a MathConstants class, reads a radius from standard input, computes the area of a circle, and displays the results to standard output.

Learning Objective: Understand how to define constants using static final

Overview

Define constants with static final and create values usable across the class.

Specifications

• Define PI (3.14159) and E (2.71828) in MathConstants class
• Make them immutable with static final
• Read one integer (radius) from standard input
• Output circle area and constant values

Input Format

radius (integer)

Output Format

PI = 3.14159
Circle area (r=<radius>): <area>
E = 2.71828

Example

Input: 5
Output:
PI = 3.14159
Circle area (r=5): 78.53975
E = 2.71828