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    <p>The problem is that the literal "99" is being treated as an int. If you add "L" it will treat it as a long. To fix your compilation problem:</p> <pre><code>long test2 = 99L * 99L * 99L * 99L * 99L; </code></pre> <p>And to fix the "incorrect result" caused by integer overflow:</p> <pre><code>long r = 99; long test1 = r * r * r * r * r; </code></pre> <p>The key point is that the expression to the right of the "=" is evaluated <em>before</em> the assignment to <code>long r</code> is done.</p> <p>There are other literal suffixes you might be interested in:</p> <pre><code>Type Suffix Example uint U or u 100U long L or l 100L ulong UL or ul 100UL float F or f 123.45F decimal M or m 123.45M </code></pre> <p>@m.edmonson, regarding your question about why it comes out to 919965907. What's happening, is that the value is "wrapping" around int.MaxValue. You can see this with a little test program: </p> <pre><code>int i = 99; // 99 i *= 99; // 9801 i *= 99; // 970299 i *= 99; // 96059601 i *= 99; // 919965907 should be 9509900499 but comes out to 919965907 // which is (9509900499 % int.MaxValue) long k = 9509900499 % int.MaxValue; </code></pre> <p>What is meant by "wrapping around"? When you exceed <code>int.MaxValue</code> by 1, the value "goes back" to <code>int.MinValue</code>.</p> <pre><code>int j = int.MaxValue; j++; bool isNowMinValue = (j == int.MinValue); // true, the value has "wrapped around" </code></pre> <p>This is a bit simplistic; if you search for "integer overflow" you will get a better explanation. It's worth understanding how integers (and other numeric types) are represented with 32 bits:</p> <p><a href="http://en.wikipedia.org/wiki/Signed_number_representations" rel="noreferrer">http://en.wikipedia.org/wiki/Signed_number_representations</a></p>
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    1. POwhy this would result in long integer overflow
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    1. POwhy this would result in long integer overflow
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    1. COExcellent answer - can you explain why he gets a different result between long and integer multiplication?
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    2. COCan you clarify what you mean by wrapping? And what thats got to do with modulus % ?
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    3. COI believe you only need one `99L`, the rest will upcast.
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      1. USBlueRaja - Danny Pflughoeft
 

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