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<title>Data type conversion</title>
<body bgcolor="#ffffcc">
<hr>
<center><h1>Data type conversion</h1></center>
<hr>
An <a href="../CONCEPT/expressions.html">operator</a> must have
<a href="../glossary.html#operand">operands</a>
of the same
type before it can carry out the operation. Because of this, C will perform
some automatic conversion of <a href="data_types.html">data types</a>.
<p>
These are the general rules for binary operators (* + / % etc):
<p>
<ul>
<li>If either operand is <b>long double</b> the other is converted to
<b>long double</b>.
<p>
<li>Otherwise, if either operand is <b>double</b> the other is converted
to <b>double</b>
<p>
<li>Otherwise, if either operand is <b>float</b> the other is converted
to <b>float</b>
<p>
<li>Otherwise, convert <b>char</b> and <b>short</b> to <b>int</b>
<p>
<li>Then, if an operand is <b>long</b> convert the other to <b>long</b>.
</ul>
<hr>
<h2>See Also</h2>
<img src="../../GRAPHICS/whiteball.gif">
<a href="../CONCEPT/cast.html">cast</a> to force a type conversion.
<br>
<img src="../../GRAPHICS/whiteball.gif">
<a href="../SYNTAX/typedef.html">typedef</a> keyword.
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<address>Martin Leslie
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