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    <p>You have assigned a character literal, which is delimited by single quotes, eg <code>'a'</code> (as distinct from a String literal, which is delimited by double quotes, eg <code>"a"</code>) to an <code>int</code> variable. Java does an automatic widening cast from the 16-bit unsigned <code>char</code> to the 32-bit signed <code>int</code>.</p> <p>However, when a character literal is a backslash followed by 1-3 digits, it is an <a href="http://en.wikipedia.org/wiki/Octal" rel="noreferrer"><em>octal</em></a> (<a href="http://en.wikipedia.org/wiki/Radix" rel="noreferrer">base/radix</a> 8) representation of the character. Thus:</p> <ul> <li><code>\15</code> = 1×8 + 5 = 13 (a carriage return; same as <code>'\r'</code>)</li> <li><code>\25</code> = 2×8 + 5 = 21 (a NAK char - negative acknowledgement)</li> <li><code>\100</code> = 1×64 + 0×8 + 0 = 64 (the @ symbol; same as <code>'@'</code>)</li> </ul> <p>For more info on character literals and escape sequences, see JLS sections:</p> <ul> <li><a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-3.html#jls-3.10.4" rel="noreferrer">3.10.4: Character Literals</a></li> <li><a href="http://docs.oracle.com/javase/specs/jls/se7/html/jls-3.html#jls-3.10.6" rel="noreferrer">3.10.6: Escape Sequences for Character and String Literals</a></li> </ul> <p>Quoting the <a href="http://en.wikipedia.org/wiki/Backus%E2%80%93Naur_Form" rel="noreferrer">BNF</a> from 3.10.6:</p> <pre><code>OctalEscape: \ OctalDigit \ OctalDigit OctalDigit \ ZeroToThree OctalDigit OctalDigit OctalDigit: one of 0 1 2 3 4 5 6 7 ZeroToThree: one of 0 1 2 3 </code></pre>
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    1. POWhat are the Java semantics of an escaped number in a character literal, e.g. '\15' ?
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    1. USBohemian
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    1. POWhat are the Java semantics of an escaped number in a character literal, e.g. '\15' ?
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    1. COI can't find it in section 3.10.1.. It's in 3.10.4, Character Literals
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      1. USRafi Kamal
    2. COThe section on integer literals is irrelevant. See [Section 3.10.4](http://docs.oracle.com/javase/specs/jls/se7/html/jls-3.html#jls-3.10.4). Also see [Section 3.10.6](http://docs.oracle.com/javase/specs/jls/se7/html/jls-3.html#jls-3.10.6) for character and string escape sequences.
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      1. USTed Hopp
    3. CO`1-3 digits` -- it should have been `0-3`. And its for 3 digit octal, two digit octal can still have from `0-7`. ex. '\77' is still valid.
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      1. USJayamohan
 

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