Even Odd in Java

Welcome to the Even Odd in Java page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

public class EvenOdd {
    public static void verifyNumber(String n) throws NumberFormatException {
        if (n.startsWith("-"))
            n = n.substring(1);
        char[] nArray = n.toCharArray();
        for (char c : nArray) {
            if (!Character.isDigit(c))
                throw new NumberFormatException();
        }
    }

    public static void ErrorAndExit() {
        System.out.println("Usage: please input a number");
        System.exit(1);
    }

    public static void main(String[] args) {
        try {
            String nstr = args[0].trim();
            verifyNumber(nstr);
            String lastDigit = nstr.substring(nstr.length() - 1);
            int n = Integer.parseInt(lastDigit);
            String result = n % 2 == 0 ? "Even" : "Odd";
            System.out.println(result);
        } catch (NumberFormatException | ArrayIndexOutOfBoundsException | StringIndexOutOfBoundsException e) {
            ErrorAndExit();
        }
    }
}

Even Odd in Java was written by:

• Jeremy Grifski
• Parker Johansen

If you see anything you'd like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of Oct 10 2022 15:04:56. The solution was first committed on Dec 30 2018 18:17:14. As a result, documentation below may be outdated.

How to Implement the Solution

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How to Run the Solution

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