// These are methods we wrote in class that return values.

import java.util.*;  // so that I can use Scanner

public class ReturnMethods {
    public static void main(String[] args) {
        // using the Math class
        System.out.println("10 to the 4th = " + Math.pow(10, 4));

        // constraining a number between 0 and 40
        int age = -5;
        age = Math.max(age, 0);
        System.out.println("age = " + age);
        
        age = 57;
        age = Math.min(age, 40);
        System.out.println("age = " + age);
        
        // using our methods that return values
        double circleArea = area(4);
        System.out.println("area of circle with radius 4 = " + circleArea);
        System.out.println("area of circle with radius 7 = " + area(7));
        
        System.out.println("body temperature (c) = " + fToC(98.6));
    }
    
    // returns the area of the circle with the given radius
    public static double area(double radius) {
        double a = Math.PI * radius * radius;
        return a;
    }
    
    // returns the Celsius equivalent to the given Fahrenheit temperature
    public static double fToC(double degreesF) {
        return 5.0 / 9.0 * (degreesF - 32);
    }
}