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    <p>In your main class you have:</p> <pre><code>Rational r1 = new Rational ( rationalNum1, rationalDen1); Rational r2 = new Rational ( rationalNum2, rationalDen2); </code></pre> <p>you are passing 2 integers to a constructer that recives void, so you have to change your constructer (of Rational class) like this:</p> <pre><code> public Rational(int rationalNumber, int rationalDen){ Numerator = rationalNumber; Denominator = rationalDen; } </code></pre> <p>Hope it helps, let me know if it worked or if there is more something wrong...</p> <p>Edit: your Scanner and print error. You have this:</p> <pre><code>public void question() { System.out.println("Do you want to exit? [y/n]"); // ask user if they want to quit with yes or no option Scanner q = new Scanner(System.in); switch (q.nextInt()) // here you are assuming that you are reading a int in step { // of a string case 'y' : // ' ' arent used for strings... System.out.println ("Thank you and goodbye."); break; case 'n' : InputMenu(); break; default: System.err.println ( "Unrecognized option" ); break; } } </code></pre> <p>so, what you need is:</p> <pre><code> public void question() { System.out.println("Do you want to exit? [y/n]"); // ask user if they want to quit with yes or no option Scanner q = new Scanner(System.in); switch (q.nextLine()) // change nextInt to nextLine, that is the string method { // of a string case "y" : //change ' ' to " " System.out.println ("Thank you and goodbye."); break; case "n" : //change ' ' to " " InputMenu(); break; default: System.err.println ( "Unrecognized option" ); break; } } </code></pre> <p>Hope it help :)</p> <p>Edit 3:</p> <p>in your code you have: ` public class RationalDriver{ public static void main(String[] args){</p> <pre><code> int rationalNum1, rationalDen1, rationalNum2, rationalDen2; // this are local variables, they only exist inside main method ...` } </code></pre> <p>So, what you can do is:</p> <pre><code> public class RationalDriver{ private static int rationalNum1, rationalDen1, rationalNum2, rationalDen2; public static void main(String[] args){ // your main } </code></pre> <p>what i did was take your local variables that <strong>only exists</strong> in your main and turn them in global variables so when you want change their value or give them a value you just do:</p> <pre><code>rationalNum1 = your valor; </code></pre> <p>Please note that if you use any variable without initialize it with a value you will get a null point exception...</p>
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    1. PONeed help compiling this iteration and interface program
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    1. COIt worked perfect, last thing is I have a problem with this default: System.err.println ( "Unrecognized option" ); break; }
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    2. COI have updated my answer for answer to your full problem...
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    3. COthat somewhat helped but my issue now is that is says all my rationalNum1 rationalDen1 etc etc under the case blocks cannot be resolved to a variable
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