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    <p>In your <code>do while</code> loop, you don't want the <code>nextLine()</code>, you just want <code>next()</code>.</p> <p>So change this:</p> <pre><code>answer = input.nextLine(); </code></pre> <p>to this:</p> <pre><code>answer = input.next(); </code></pre> <p>Note, as others have suggested, you could convert this to a <code>while</code> loop. The reason for this is that <code>do while</code> loops are used when you need to execute a loop at least once, but you don't know how often you need to execute it. Whilst it's certainly doable in this case, something like this would suffice:</p> <pre><code>System.out.println("Do you want to play again? (Y/N) "); answer = input.next(); while (!answer.equalsIgnoreCase("y") &amp;&amp; !answer.equalsIgnoreCase("n")) { System.out.println("That is not valid input. Please enter again"); answer = input.next(); } if (answer.equalsIgnoreCase("n")) keepPlaying = false; </code></pre> <p>The <code>while</code> loop keeps looping as long as "y" or "n" (ignoring case) isn't entered. As soon as it is, the loop ends. The <code>if</code> conditional changes the keepPlaying value if necessary, otherwise nothing happens and your outer <code>while</code> loop executes again (thus restarting the program).</p> <p><strong>Edit: This explains WHY your original code didn't work</strong></p> <p>I should add, the reason your original statement didn't work was because of your first <code>do while</code> loop. In it, you use:</p> <pre><code>guess = input.nextInt(); </code></pre> <p>This reads the number off the line, but not the return of the line, meaning when you use:</p> <pre><code>answer = input.nextLine(); </code></pre> <p>It immediately detects the leftover carriage from the <code>nextInt()</code> statement. If you don't want to use my solution of reading just <code>next()</code> you could swallow that leftover by doing this:</p> <pre><code>guess = input.nextInt(); input.nextLine(); rest of code as normal... </code></pre>
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    1. COYour suggested while loop will cause an infinite loop as it stands currently.
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      1. USFGreg
    2. CO@FGreg: Whoops! Absolutely spot on, have amended it. Thanks for that.
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    3. CO@AndrewMartin Thank you soooooooooo much! I really appreaciated it :D
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