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POMy boolean statement works one way but not in a seemingly unchanged way
 

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  1. POMy boolean statement works one way but not in a seemingly unchanged way
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    <p>In an attempt to make my code a bit more aesthetic and short, I tried to change my code from this:</p> <pre><code>do { System.out.print("Enter day: "); day = input.nextInt(); if ((isLeapYear &amp;&amp; month == 2 &amp;&amp; (day &lt; 1 || day &gt; 29)) || (!isLeapYear &amp;&amp; month == 2 &amp;&amp; (day &lt; 1 || day &gt; 28)) || ((month == 4 || month == 6 || month == 9 || month == 11) &amp;&amp; (day &lt; 1 || day &gt; 30)) || ((month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month ==12) &amp;&amp; (day &lt; 1 || day &gt; 30))) { System.out.println("Invalid input"); } } while ((isLeapYear &amp;&amp; month == 2 &amp;&amp; (day &lt; 1 || day &gt; 29)) || (!isLeapYear &amp;&amp; month == 2 &amp;&amp; (day &lt; 1 || day &gt; 28)) || ((month == 4 || month == 6 || month == 9 || month == 11) &amp;&amp; (day &lt; 1 || day &gt; 30)) || ((month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month ==12) &amp;&amp; (day &lt; 1 || day &gt; 30))); </code></pre> <p>to this:</p> <pre><code>boolean invalidDay = (isLeapYear &amp;&amp; month == 2 &amp;&amp; (day &lt; 1 || day &gt; 29)) || (!isLeapYear &amp;&amp; month == 2 &amp;&amp; (day &lt; 1 || day &gt; 28)) || ((month == 4 || month == 6 || month == 9 || month == 11) &amp;&amp; (day &lt; 1 || day &gt; 30)) || ((month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month ==12) &amp;&amp; (day &lt; 1 || day &gt; 30)); do { System.out.print("Enter day: "); day = input.nextInt(); if (invalidDay) { System.out.println("Invalid input"); } } while (invalidDay); </code></pre> <p>The second one does not work as intended but the first way works perfectly. The only thing I have changed is putting the long boolean expression into a single boolean variable. Thanks.</p>
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    1. COperhaps you should recompute the condition inside the loop?
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      1. USJohn Dvorak
    2. COdid you try tracing this method with a debugger? It should reveal your mistake.
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      1. USJohn Dvorak
    3. COJust a tought. If you try to verify if the date is valid, there should be an easier way. Look at [this](http://stackoverflow.com/questions/226910/how-to-sanity-check-a-date-in-java).
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