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authorTobias Klauser <tklauser@distanz.ch>2008-01-27 11:37:44 +0100
committerTobias Klauser <tklauser@xenon.tklauser.home>2008-01-27 11:37:44 +0100
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+<title>Assignment operators.</title>
+<body bgcolor="#ffffcc">
+<hr>
+<center>
+<h1>Assignment operators.</h1>
+</center>
+<hr>
+
+C has the following assignement operators:
+<pre>
+ = += -= *= /= %= <<= >>= &= ^= |=
+</pre>
+= is the obvious one. It takes the result of the expression on the right
+and assigns it to the variable on the left (lvalue).
+<pre>
+ main ()
+ {
+ int a, b=4, c=10;
+ a = b + c;
+ }
+</pre>
+I know this is stating the obvious, but:
+<ol>
+<li><b>b</b> is assigned the value 4
+<li><b>c</b> is assigned the value 10
+<li><b>a</b> is assigned the result of b plus C (14).
+</ol>
+
+<hr>
+All the other operators act in a simular way. If you find yourself
+coding the example on the left, it could be changed to the example on
+the right.
+<pre>
+ main () main()
+ { {
+ int a=4; int a=4;
+ a = a * 4; a *= 4;
+ } }
+</pre>
+The rule is as follows:
+<p>
+The lvalue is multiplied by the rvalue and the result assigned to the
+lvalue.
+<p>
+Here is another example.
+<pre>
+ main() main()
+ { {
+ int a=10, b=2; int a=10, b=2;
+ a /= b * 5; a = a / (b*5);
+ } }
+</pre>
+Again both preduce the same answer (1).
+<p>
+<hr>
+
+<img src=../../GRAPHICS/whiteball.gif>
+<a href="inc_dec.html">Increment (++) and Decrement (--)</a><br>
+
+<img src=../../GRAPHICS/whiteball.gif>
+<a href="bit_shift.html">Bit shifting ( >>= <<= )</a><br>
+
+<img src=../../GRAPHICS/whiteball.gif>
+<a href="precedence.html">Operator precedence table.</a>
+<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>