title: C# modulus operator
body: <p>I can write the program</p>
  
  <pre><code>int a = 3;
  int b = 4;
  
  Console.WriteLine(a % b);
  </code></pre>
  
  <p>The answer I get is 3.  How does 3 mod 4 = 3??? </p>
  
  <p>I can't figure out how this is getting computed this way.</p>