144 lines
5.1 KiB
HTML
144 lines
5.1 KiB
HTML
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<html>
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<head>
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<title>printf</title>
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<link rel="stylesheet" type="text/css" media="all" href="../man.css">
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</head>
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<body bgcolor=#ffffff>
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<h2 align=center>printf</h2>
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<h4 align=center>OS/161 Reference Manual</h4>
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<h3>Name</h3>
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<p>
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printf - print formatted output
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</p>
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<h3>Library</h3>
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<p>
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Standard C Library (libc, -lc)
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</p>
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<h3>Synopsis</h3>
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<p>
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<tt>#include <stdio.h></tt><br>
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<br>
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<tt>int</tt><br>
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<tt>printf(const char *</tt><em>format</em><tt>, ...);</tt>
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</p>
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<h3>Description</h3>
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<p>
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<tt>printf</tt> prints formatted text to standard output. The text is
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generated from the <em>format</em> argument and subsequent arguments
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according to the following rules.
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</p>
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<p>
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Characters in <em>format</em> that are not the percent sign
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(<tt>%</tt>) are printed verbatim. When a percent sign is encountered,
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the next argument of the arguments following <em>format</em> is
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retrieved and printed. The type of the argument expected, as well as
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some simple formatting instructions, are derived from the characters
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following the percent sign.
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</p>
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<p>
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The following characters designate types to print. One of these
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characters concludes the format sequence begun with a percent sign,
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and also determines the type expected as an argument.
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</p>
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<table width=90%>
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<tr><td width=5% rowspan=9>
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<td width=5%>%</td> <td>A percent sign is printed; no argument
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is consumed.</td></tr>
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<tr><td>c</td> <td>Character (char, passed as an integer value)</td></tr>
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<tr><td>d</td> <td>Signed integer value printed in decimal</td></tr>
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<tr><td>o</td> <td>Unsigned integer value printed in octal</td></tr>
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<tr><td>p</td> <td>Pointer (void *)</td></tr>
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<tr><td>s</td> <td>String (const char *)</td></tr>
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<tr><td>u</td> <td>Unsigned integer value printed in decimal</td></tr>
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<tr><td>x</td> <td>Unsigned integer value printed in hexadecimal</td></tr>
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<tr><td>X</td> <td>Unsigned integer value printed in uppercase hex</td></tr>
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</table>
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<p>
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The following characters are modifiers; they can be found between the
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percent sign and the type designator.
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</p>
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<table width=90%>
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<tr><td width=5% rowspan=6>
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<td width=5% valign=top>#</td> <td>Select an "alternate
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format". On integer formats this
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causes the C base prefix to be printed
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along with the integer. On other
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formats, this has no effect.</td></tr>
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<tr><td valign=top>l</td> <td>Assume an integer argument is
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<tt>long</tt> or <tt>unsigned
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long</tt> instead of <tt>int</tt> or
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<tt>unsigned int</tt>. If repeated,
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the argument is taken to be <tt>long
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long</tt> or <tt>unsigned long
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long</tt>. </td></tr>
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<tr><td valign=top>z</td> <td>Assume an integer argument is
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<tt>ssize_t</tt> or <tt>size_t</tt>
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instead of <tt>int</tt> or
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<tt>unsigned int</tt>. </td></tr>
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<tr><td valign=top>0-9</td> <td>Digits are treated as a decimal number,
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which is considered to be the field
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width. The argument is printed
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right-aligned in a field that many
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characters wide.</td></tr>
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<tr><td valign=top>0</td> <td>If the field width has a leading 0, the
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padding character for alignment is
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made 0 (zero) instead of
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space.</td></tr>
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<tr><td valign=top>-</td> <td>If a field width is given, use it for
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left alignment instead of right
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alignment.</td></tr>
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</table>
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<h3>Restrictions</h3>
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<p>
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Note that this is a limited printf implementation - it has no support
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for precisions (".number" as a modifier), floating-point formats,
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field widths passed as arguments, or the rarely-used plus and space
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modifiers.
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</p>
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<h3>Return Values</h3>
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<p>
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<tt>printf</tt> returns the number of characters printed.
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</p>
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</body>
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</html>
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