| <html><head><META http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Addition and Subtraction:</title><link href="book.css" rel="stylesheet" type="text/css"><link href="../book.css" rel="stylesheet" type="text/css"><meta content="DocBook XSL Stylesheets V1.74.0" name="generator"><link rel="home" href="index.html" title="XPath 2.0 Processor User Manual"><link rel="up" href="ch02s03s05.html" title="Arithmetic Expressions"><link rel="prev" href="ch02s03s05s02.html" title="Multiplication and Division:"><link rel="next" href="ch02s03s06.html" title="Range expressions"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="section" lang="en"><div class="titlepage"><div><div><h4 class="title"><a name="Addition_and_Subtraction:"></a>Addition and Subtraction:</h4></div></div></div><p>The operators <span class="bold"><strong>+</strong></span> and <span class="italic">'-'</span> perform addition and subtraction of | |
| numbers, in the usual way. Once again, if the operands are of | |
| different types, XPath 2.0 specifications say one of them is | |
| promoted but numeric type promotion is currently unsupported by | |
| PsychoPath. The result is of the same type as the operands.</p><p>Examples of above would be:</p><p><pre class="programlisting"> -(5 + 7)</pre></p><p> <span class="bold"><strong>result:</strong></span></p><div class="orderedlist"><ol type="1"><li><p>xs:integer: -12</p></li></ol></div><p><pre class="programlisting">-xs:float(’1.23’)</pre></p><p> <span class="bold"><strong>result:</strong></span></p><div class="orderedlist"><ol type="1"><li><p>xs:float: -1.23</p></li></ol></div><p><pre class="programlisting">-xs:double(’1.23’)</pre></p><p> <span class="bold"><strong>result:</strong></span></p><div class="orderedlist"><ol type="1"><li><p>xs:double: -1.23</p></li></ol></div><p><pre class="programlisting">(+5 - +7)</pre></p><p> <span class="bold"><strong>result:</strong></span></p><div class="orderedlist"><ol type="1"><li><p>xs:integer: -2</p></li></ol></div><p><pre class="programlisting">(1 to 5 div 0 )</pre></p><p> <span class="bold"><strong>result:</strong></span></p><div class="itemizedlist"><ul type="disc"><li><p>FAIL (division by zero!)</p></li></ul></div><p><pre class="programlisting">5*6*10*5*96 div 20 div 3 div 1</pre></p><p> <span class="bold"><strong>result:</strong></span></p><div class="orderedlist"><ol type="1"><li><p>xs:decimal: 2400.0</p></li></ol></div><p><pre class="programlisting">31 mod 15</pre></p><p> <span class="bold"><strong>result:</strong></span></p><div class="orderedlist"><ol type="1"><li><p>xs:integer: 1</p></li></ol></div></div></body></html> |