class Main {

    public static void main(String[] args) {

        // testing the equals() method

        double angle = 89.999999;

        System.out.println(equals(angle, 90.0, 0.001)); // should be equal
        System.out.println(equals(angle, 91.0, 0.001)); // should be unequal

    } // end main()






    /**
    * equals is used to compare two real numbers for equality to within
    * a specified tolerance
    *
    * @author Peter Gehbauer
    * @version 1.0 March 2, 2021
    *
    * @param value the number to be compared
    * @param target the number being compared to
    * @param tolerance the maximum difference allowed for value to be considered equal to target
    *
    * @return true if value is within tolerance of target; false otherwise
    */
    private static boolean equals(double value, double target, double tolerance) {
        return (Math.abs(value-target) < tolerance);
    } // end equals ()






} // end class Main