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<title>strcpy function</title>
<head>
<script language="JavaScript">
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<hr>
<center>
<h1>strcpy function</h1>
</center>
<hr>
<p>
<b>strcpy</b> copies a string. This function will copy the bytes
stored at the location pointed to by 's2' to the location pointed to by 's1'.
<pre>
s1 s2
| |
V V
- - - - - - - --
| | | | | |a|b|c|\0|
- - - - - - - --
^ ^ | |
| | | |
-|------------- |
---------------
</pre>
<hr>
<pre>
Library: string.h
Prototype: char strcpy(char *s1, const char *s2);
Syntax:
char string2[20]="red dwarf";
char string1[20]="";
strcpy(string1, string2);
</pre>
<hr>
<h2>Notes</h2>
Dont forget that strings are terminated with a
'<a href="../SYNTAX/null.html">\0</a>' so allow space for it...
<p>
There is another way to code the example above. Consider this piece of
code.
<pre>
main()
{
char *string2="red dwarf";
char *string1;
string1=string2;
}
</pre>
'string2' is now a character pointer (only one byte) that points to a
storage location containing "red dwarf" (a
<a href="../CONCEPT/constants.html#str">string constant</a>). So
<b>string1=string2;</b> copies the address of "red dwarf" into
'string1'. This version of the code will execute quicker than strcpy
because less data is being moved around the system.
<hr>
<img src="../../GRAPHICS/computer.gif">
<a href="../EXAMPLES/strcpy.c">example program.</a>
<hr>
<h2>See also:</h2>
<img src="../../GRAPHICS/whiteball.gif">
<a href="strtok.html">strtok</a>
<br>
<img src="../../GRAPHICS/whiteball.gif">
<a href="strncpy.html">strncpy</a>
<br>
<img src="../../GRAPHICS/whiteball.gif">
<a href="sprintf.html">sprintf</a>
<br>
<img src="../../GRAPHICS/man.gif">
<a href="../MAN/strcat.htm"><i>strcat</a>
<br>
<img src="../../GRAPHICS/whiteball.gif">
<a href="../CONCEPT/string.html">strings</a>
<br>
<img src="../../GRAPHICS/whiteball.gif">
<a href="memcpy.htm">memcpy</a> Copy data between tow memory locations.
<p>
<p>
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<hr>
<address>Martin Leslie
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