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| author | Tobias Klauser <tklauser@distanz.ch> | 2008-01-27 11:37:44 +0100 |
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| committer | Tobias Klauser <tklauser@xenon.tklauser.home> | 2008-01-27 11:37:44 +0100 |
| commit | 7e0f021a9aec35fd8e6725e87e3313b101d26f5e (patch) | |
| tree | b1cacc4b24393f517aeb4610e9e1021f954307a8 /reference/C/SYNTAX/sizeof.html | |
Initial import (2.0.2-6)2.0.2-6
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| -rw-r--r-- | reference/C/SYNTAX/sizeof.html | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/reference/C/SYNTAX/sizeof.html b/reference/C/SYNTAX/sizeof.html new file mode 100644 index 0000000..34dc287 --- /dev/null +++ b/reference/C/SYNTAX/sizeof.html @@ -0,0 +1,130 @@ +<title>The sizeof operator</title> +<head> +<script language="JavaScript"> +</script> +</head> +<body bgcolor="#ffffcc"> +<hr> +<center> +<h1>The sizeof operator</h1> +</center> +<hr> +<p> +<b>sizeof</b> will return the number of bytes reserved for a variable or +<a href="../CONCEPT/data_types.html">data type</a>. +<p> +The following code shows <b>sizeof</b> returning the length of a data type. +<p> +<table border=2 width="100%" bgcolor=ivory> +<tr> +<td> +<pre> + + /* How big is an int? expect an answer of 4. */ + + main() + { + printf("%d \n", sizeof(int)); + } +</pre> +</td> +</tr> +</table> +<p> + +<b>sizeof</b> will also return the number of bytes reserved for a +<a href="struct.html">structure</a>. +<p> +<table border=2 width="100%" bgcolor=ivory> +<tr> +<td> +<pre> + + /* Will print 8 on most machines. */ + + main() + { + struct + { + int a; + int b; + } TwoInts; + + printf("%d \n", sizeof(TwoInts)); + } + +</pre> +</td> +</tr> +</table> +<p> +Finally, <b>sizeof</b> will return the length of a variable. + +<p> +<table border=2 width="100%" bgcolor=ivory> +<tr> +<td> +<pre> + + main() + { + char String[20]; + + printf ("%d \n", sizeof String); + printf ("%d \n", sizeof (String)); + } + +</pre> +</td> +</tr> +</table> +<p> +In the example above I have printed the size of 'String' twice. This is to +show that when dealing with variables, the brackets are optional. + +I recommend that you always place the brackets around the sizeof argument. +<p> +<hr> +<h2>Examples:</h2> +<a href="../EXAMPLES/sizeof.c">Example 1</a> Data types. +<p> +<a href="../EXAMPLES/sizeof1.c">Example 2</a> Data objects. + +<p> +<hr> +<h2>See also:</h2> +<img src="../../GRAPHICS/whiteball.gif"> +The <a href="../FUNCTIONS/strlen.html">strlen </a>function. +<p> +<img src="../../GRAPHICS/whiteball.gif"> +Other <a href="../CONCEPT/expressions.html">operators</a> +<p> +<img src="../../GRAPHICS/whiteball.gif"> +<a href="../FUNCTIONS/malloc.html">malloc</a> function. + + +<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> |