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<head>
<title>C operators</title>
</head>
<body bgcolor="#ffffcc">
<hr>
<center>
<h1>C Operators/Expressions</h1>
</center>
<hr>
<p>
Operators are used with
<a href="../glossary.html#operand">operands</a>
to build expressions. For example the
following is an expression containing two operands and one oprator.
<pre>
4 + 5
</pre>
The following list of operators is probably not complete but does highlight
the common
operators and a few of the outrageous ones....
<p>
C contains the following operator groups.
<ul>
<li><a href="#arith">Arithmetic</a>
<li><a href="#ass">Assignment</a>
<li><a href="#rel">Logical/relational</a>
<li><a href="#bit">Bitwise</a>
<li><a href="#star">Odds and ends!</a>
<p>
<li><a href="precedence.html">Operator precedence table.</a>
</ul>
The order (precedence) that operators are evaluated can be seen
<a href="precedence.html">here.</a>
<h2><a name=arith>Arithmetic</h2>
<pre>
+
-
/
*
% <a href="../EXAMPLES/modulo.c">modulo</a>
-- <a href="inc_dec.html">Decrement</a> (post and pre)
++ <a href="inc_dec.html">Increment</a> (post and pre)
</pre>
<h2><a name=ass>Assignment</h2>
These all perform an arithmetic operation on the lvalue and assign the
result to the lvalue. So what does this mean in English? Here is an example:
<pre> counter = counter + 1; </pre>
can be reduced to
<pre> counter += 1; </pre>
Here is the full set.
<pre>
=
*= <a href="assignment.html">Multiply</a>
/= <a href="assignment.html">Divide.</a>
%= <a href="assignment.html">Modulus.</a>
+= <a href="assignment.html">add.</a>
-= <a href="assignment.html">Subtract.</a>
<<= <a href="assignment.html">left shift.</a>
>>= <a href="assignment.html">Right shift.</a>
&= <a href="assignment.html">Bitwise AND.</a>
^= <a href="assignment.html">bitwise exclusive OR (XOR).</a>
|= <a href="assignment.html">bitwise inclusive OR.</a>
</pre>
<h2><a name=rel>Logical/Relational</h2>
<pre>
== Equal to
!= Not equal to
>
<
>=
<=
&& <a href="../SYNTAX/logical.html">Logical AND</a>
|| <a href="../SYNTAX/logical.html">Logical OR</a>
! <a href="../SYNTAX/logical.html">Logical NOT</a>
</pre>
<h2><a name=bit>Bitwise</h2>
<pre>
& <a href="../CONCEPT/bitwise.html">AND (Binary operator)</a>
| <a href="../CONCEPT/bitwise.html">inclusive OR</a>
^ <a href="../CONCEPT/bitwise.html">exclusive OR</a>
<< <a href="../CONCEPT/bit_shift.html">shift left</a>. <font color=brown>C ++ use of <a href=../../CPLUSPLUS/SYNTAX/ops.html><<</a></font>
>> <a href="../CONCEPT/bit_shift.html">shift right</a>. <font color=brown>C ++ use of <a href=../../CPLUSPLUS/SYNTAX/ops.html>>></a></font>
~ <a href="../CONCEPT/bitwise.html">one's complement</a>
</pre>
<a name=comma>
<h2><a name=star>Odds and ends!</h2>
<pre>
sizeof() <a href="../SYNTAX/sizeof.html">size</a> of objects and <a href="data_types.html">data types</a>.
<a href="../FUNCTIONS/strlen.html">strlen</a> may also be of interest.
& <a href="../EXAMPLES/address.c">Address of</a> (Unary operator)
* <a href="../EXAMPLES/address.c">pointer</a> (Unary operator)
? <a href="../SYNTAX/conditional.html">Conditional expressions</a>
: <a href="../SYNTAX/conditional.html">Conditional expressions</a>
, <a href="../SYNTAX/comma.html">Series operator.</a>
</pre>
<hr>
<p>
<h2>C++ Extensions</h2>
<font color=brown>
Read about :: >> and << in the world of C++
<a href=../../CPLUSPLUS/SYNTAX/ops.html>here!</a>
</font>
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<address>Martin Leslie
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