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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>The VOID keyword.</title>
+<head>
+<script language="JavaScript">
+</script>
+</head>
+<body bgcolor="#ffffcc">
+<hr>
+<center><h1>The VOID keyword.</h1></center>
+<hr>
+<p>
+The <b>void</b> <a href="../glossary.html#keyword">keyword</a>
+allows us to create functions that either do not require any
+parameters or do not return a value.<p>
+The following example shows a function that does not return
+a value.
+<p>
+<table border=2 width="100%" bgcolor=ivory>
+<tr>
+<td>
+<pre>
+
+ void Print_Square(int Number);
+
+ main()
+ {
+ Print_Square(10);
+ exit(0);
+ }
+
+ void Print_Square(int Number)
+ {
+ printf("%d squared is %d\n",Number, Number*Number);
+ }
+</pre>
+</td>
+</tr>
+</table>
+<p>
+The next example shows a function that does not require any parameters:
+<p>
+<table border=2 width="100%" bgcolor=ivory>
+<tr>
+<td>
+<pre>
+
+ #include <stdlib.h>
+ #include <time.h>
+
+ int Random(void);
+
+ main()
+ {
+ printf("A random number is %d\n", Random());
+ exit(0);
+ }
+
+ int Random(void)
+ {
+ srand((unsigned int)time((time_t *)NULL));
+ return( rand());
+ }
+
+</pre>
+</td>
+</tr>
+</table>
+<p>
+<hr>
+<h2>Example:</h2>
+<img src="../../GRAPHICS/computer.gif">
+<a href="../EXAMPLES/pointer_func.c">void example</a>
+<hr>
+<h2>See also:</h2>
+<img src="../../GRAPHICS/whiteball.gif">
+<a href="../SYNTAX/functions.html">Functions</a>
+<a href="../SYNTAX/functions.html#void">Void pointers</a>
+<p>
+
+
+<p>
+
+<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="keywords.html"> Keywords</a>
+</td><td width="25%">
+<a href="../FUNCTIONS/funcref.htm"> Functions</a>
+</td>
+</tr>
+</table>
+</center>
+<p>
+<hr>
+<address>Martin Leslie
+</address><p>
+</body>
+</html>