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copied!<blockquote> <p>I don't understand how an int 63823, takes up less space than a double 1.0. Is there not more information stored in the int, in this particular instance?</p> </blockquote> <p>Good question. What you're seeing when you see <code>63823</code> and <code>1.0</code> is a <em>representation</em> of the underlying data, you are <em>not</em> seeing the underlying data. It is specially formatted so that <em>you</em> can read it, but it is <em>not</em> how the <em>machine</em> sees it.</p> <p>Java uses very special formats for representing <code>int</code> and <code>double</code>. You need to look at <a href="http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html" rel="nofollow noreferrer"><em>those</em> representations</a> to understand why <code>63823</code> takes thirty-two bits when represented as a Java <code>int</code> and <code>1.0</code> takes sixty-four bits when represented as a Java <code>double</code>.</p> <p>In particular, 63823 as an <code>int</code> in Java is <a href="https://stackoverflow.com/questions/13422259/how-are-integers-internally-represented-at-a-bit-level-in-java">represented </a>as:</p> <pre><code>00000000000000001111100101001111 </code></pre> <p>and 1.0 as a <code>double</code> is <a href="https://en.wikipedia.org/wiki/IEEE_floating_point" rel="nofollow noreferrer">represented</a> in Java as:</p> <pre><code>0011111111110000000000000000000000000000000000000000000000000000 </code></pre> <p>If you want to explore more, I recommend <a href="http://en.wikipedia.org/wiki/Two's_complement" rel="nofollow noreferrer">Two's Complement</a> and <a href="http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html" rel="nofollow noreferrer">What Every Computer Scientist Should Know About Floating-Point Arithmetic</a>.</p>

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