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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/FUNCTIONS/printf.html | |
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diff --git a/reference/C/FUNCTIONS/printf.html b/reference/C/FUNCTIONS/printf.html new file mode 100644 index 0000000..111a8e7 --- /dev/null +++ b/reference/C/FUNCTIONS/printf.html @@ -0,0 +1,106 @@ +<title>printf function</title> + +<head> +<script language="JavaScript"> +</script> +</head> + +<body bgcolor="#ffffcc"> +<hr> +<center> +<h1>printf function</h1> +</center> +<hr> +<p> +<b>printf</b> is used to O/P data to +<a href="../MISC/stdfiles.html">STDOUT</a> (usually the screen). It has many +formatting options which we shall look at in a moment. + +<hr> +<h2>printf syntax</h2> +This is an example of <b>printf</b> in its simplest form. +<p> +<center> +<table border=2 bgcolor=ivory> +<tr> +<td> +<pre> + + #include <stdio.h> + + main() + { + printf("This text will appear on the screen\n"); + } +</pre> +</td> +</tr> +</table> +</center> +<p> +printf is passed one formatting argument. +The unusual thing about the example (in my mind) is <b>\n</b>, this is actually +an <a href="escape.html"> escape sequence</a> that signals a new line. Without +it, any printf's +that follow would O/P to the same line. +<b>printf</b> also takes extra arguments which are inserted into the format +string at locations marked with a <b>%</b>. +<p> +<center> +<table border=2 bgcolor=ivory> +<tr> +<td> +<pre> + + #include <stdio.h> + + main() + { + int number=42; + printf("The answer is %i\n", number); + } +</pre> +</td> +</tr> +</table> +</center> +<p> +What happens here is the <b>%i</b> is seen as a +<a href="format.html">formatting identifer</a> for the +next argument (number). In this case an integer is expected.<p> + +<hr> +<h2>See also</h2> +<ol> +<li><a href="puts.html">puts</a> Much easier to use - but not as powerfull. +<li><a href="sprintf.html">sprintf</a> Same as 'printf' but O/P to a string array. +<li><a href="../CONCEPT/string.html">Strings</a>. +<li><a href="../SYNTAX/idioms.html#printf">A dead handy printf idiom.</a>. +</ol> + + +<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="../SYNTAX/keywords.html"> Keywords</a> +</td><td width="25%"> +<a href="funcref.htm"> Functions</a> +</td> +</tr> +</table> +</center> +<p> +<hr> +<address>Martin Leslie +</address><p> +</body> +</html> |