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| author | Tobias Klauser <tklauser@distanz.ch> | 2008-01-27 11:37:44 +0100 |
|---|---|---|
| committer | Tobias Klauser <tklauser@xenon.tklauser.home> | 2008-01-27 11:37:44 +0100 |
| commit | 7e0f021a9aec35fd8e6725e87e3313b101d26f5e (patch) | |
| tree | b1cacc4b24393f517aeb4610e9e1021f954307a8 /reference/C/CONCEPT/expressions.html | |
Initial import (2.0.2-6)2.0.2-6
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diff --git a/reference/C/CONCEPT/expressions.html b/reference/C/CONCEPT/expressions.html new file mode 100644 index 0000000..a3dac05 --- /dev/null +++ b/reference/C/CONCEPT/expressions.html @@ -0,0 +1,135 @@ +<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> +<hr> +<p> +<center> +<table border=2 width=80% bgcolor=ivory> +<tr align=center> +<td width=25%> +<a href="../cref.html">Top</a> +</td><td width=25%> +<a href="../master_index.html">Master Index</a> +</td><td width=25%> +<a href="../SYNTAX/keywords.html">Keywords</a> +</td><td width=25%> +<a href="../FUNCTIONS/funcref.htm">Functions</a> +</td> +</tr> +</table> +</center> +<p> + +<hr> +<address>Martin Leslie +<script language="JavaScript"> +<!-- // +document.write(document.lastModified); +// --> +</script> +</address> |