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</script></head><body><div id="package-header"><ul class="links" id="page-menu"><li><a href="index.html">Contents</a></li><li><a href="doc-index.html">Index</a></li></ul><p class="caption">base-4.5.1.0: Basic libraries</p></div><div id="content"><div id="module-header"><table class="info"><tr><th>Portability</th><td>portable</td></tr><tr><th>Stability</th><td>provisional</td></tr><tr><th>Maintainer</th><td>lennart@augustsson.net</td></tr><tr><th>Safe Haskell</th><td>Safe</td></tr></table><p class="caption">Text.Printf</p></div><div id="description"><p class="caption">Description</p><div class="doc"><p>A C printf like formatter.
</p></div></div><div id="synopsis"><p id="control.syn" class="caption expander" onclick="toggleSection('syn')">Synopsis</p><ul id="section.syn" class="hide" onclick="toggleSection('syn')"><li class="src short"><a href="#v:printf">printf</a> :: <a href="Text-Printf.html#t:PrintfType">PrintfType</a> r =&gt; <a href="Data-String.html#t:String">String</a> -&gt; r</li><li class="src short"><a href="#v:hPrintf">hPrintf</a> :: <a href="Text-Printf.html#t:HPrintfType">HPrintfType</a> r =&gt; <a href="GHC-IO-Handle.html#t:Handle">Handle</a> -&gt; <a href="Data-String.html#t:String">String</a> -&gt; r</li><li class="src short"><span class="keyword">class</span>  <a href="#t:PrintfType">PrintfType</a> t </li><li class="src short"><span class="keyword">class</span>  <a href="#t:HPrintfType">HPrintfType</a> t </li><li class="src short"><span class="keyword">class</span>  <a href="#t:PrintfArg">PrintfArg</a> a </li><li class="src short"><span class="keyword">class</span>  <a href="#t:IsChar">IsChar</a> c </li></ul></div><div id="interface"><h1>Documentation</h1><div class="top"><p class="src"><a name="v:printf" class="def">printf</a> :: <a href="Text-Printf.html#t:PrintfType">PrintfType</a> r =&gt; <a href="Data-String.html#t:String">String</a> -&gt; r</p><div class="doc"><p>Format a variable number of arguments with the C-style formatting string.
 The return value is either <code><a href="Data-String.html#t:String">String</a></code> or <code>(<code><a href="System-IO.html#t:IO">IO</a></code> a)</code>.
</p><p>The format string consists of ordinary characters and /conversion
 specifications/, which specify how to format one of the arguments
 to printf in the output string.  A conversion specification begins with the
 character <code>%</code>, followed by one or more of the following flags:
</p><pre>    -      left adjust (default is right adjust)
    +      always use a sign (+ or -) for signed conversions
    0      pad with zeroes rather than spaces
</pre><p>followed optionally by a field width:
</p><pre>    num    field width
    *      as num, but taken from argument list
</pre><p>followed optionally by a precision:
</p><pre>    .num   precision (number of decimal places)
</pre><p>and finally, a format character:
</p><pre>    c      character               Char, Int, Integer, ...
    d      decimal                 Char, Int, Integer, ...
    o      octal                   Char, Int, Integer, ...
    x      hexadecimal             Char, Int, Integer, ...
    X      hexadecimal             Char, Int, Integer, ...
    u      unsigned decimal        Char, Int, Integer, ...
    f      floating point          Float, Double
    g      general format float    Float, Double
    G      general format float    Float, Double
    e      exponent format float   Float, Double
    E      exponent format float   Float, Double
    s      string                  String
</pre><p>Mismatch between the argument types and the format string will cause
 an exception to be thrown at runtime.
</p><p>Examples:
</p><pre>   &gt; printf &quot;%d\n&quot; (23::Int)
   23
   &gt; printf &quot;%s %s\n&quot; &quot;Hello&quot; &quot;World&quot;
   Hello World
   &gt; printf &quot;%.2f\n&quot; pi
   3.14
</pre></div></div><div class="top"><p class="src"><a name="v:hPrintf" class="def">hPrintf</a> :: <a href="Text-Printf.html#t:HPrintfType">HPrintfType</a> r =&gt; <a href="GHC-IO-Handle.html#t:Handle">Handle</a> -&gt; <a href="Data-String.html#t:String">String</a> -&gt; r</p><div class="doc"><p>Similar to <code><a href="Text-Printf.html#v:printf">printf</a></code>, except that output is via the specified
 <code><a href="GHC-IO-Handle.html#t:Handle">Handle</a></code>.  The return type is restricted to <code>(<code><a href="System-IO.html#t:IO">IO</a></code> a)</code>.
</p></div></div><div class="top"><p class="src"><span class="keyword">class</span>  <a name="t:PrintfType" class="def">PrintfType</a> t </p><div class="doc"><p>The <code><a href="Text-Printf.html#t:PrintfType">PrintfType</a></code> class provides the variable argument magic for
 <code><a href="Text-Printf.html#v:printf">printf</a></code>.  Its implementation is intentionally not visible from
 this module. If you attempt to pass an argument of a type which
 is not an instance of this class to <code><a href="Text-Printf.html#v:printf">printf</a></code> or <code><a href="Text-Printf.html#v:hPrintf">hPrintf</a></code>, then
 the compiler will report it as a missing instance of <code><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a></code>.
</p></div><div class="subs instances"><p id="control.i:PrintfType" class="caption collapser" onclick="toggleSection('i:PrintfType')">Instances</p><div id="section.i:PrintfType" class="show"><table><tr><td class="src"><a href="Text-Printf.html#t:IsChar">IsChar</a> c =&gt; <a href="Text-Printf.html#t:PrintfType">PrintfType</a> [c]</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfType">PrintfType</a> (<a href="System-IO.html#t:IO">IO</a> a)</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src">(<a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> a, <a href="Text-Printf.html#t:PrintfType">PrintfType</a> r) =&gt; <a href="Text-Printf.html#t:PrintfType">PrintfType</a> (a -&gt; r)</td><td class="doc empty">&nbsp;</td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">class</span>  <a name="t:HPrintfType" class="def">HPrintfType</a> t </p><div class="doc"><p>The <code><a href="Text-Printf.html#t:HPrintfType">HPrintfType</a></code> class provides the variable argument magic for
 <code><a href="Text-Printf.html#v:hPrintf">hPrintf</a></code>.  Its implementation is intentionally not visible from
 this module.
</p></div><div class="subs instances"><p id="control.i:HPrintfType" class="caption collapser" onclick="toggleSection('i:HPrintfType')">Instances</p><div id="section.i:HPrintfType" class="show"><table><tr><td class="src"><a href="Text-Printf.html#t:HPrintfType">HPrintfType</a> (<a href="System-IO.html#t:IO">IO</a> a)</td><td class="doc empty">&nbsp;</td></tr><tr><td class="src">(<a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> a, <a href="Text-Printf.html#t:HPrintfType">HPrintfType</a> r) =&gt; <a href="Text-Printf.html#t:HPrintfType">HPrintfType</a> (a -&gt; r)</td><td class="doc empty">&nbsp;</td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">class</span>  <a name="t:PrintfArg" class="def">PrintfArg</a> a </p><div class="subs instances"><p id="control.i:PrintfArg" class="caption collapser" onclick="toggleSection('i:PrintfArg')">Instances</p><div id="section.i:PrintfArg" class="show"><table><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Char.html#t:Char">Char</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Prelude.html#t:Double">Double</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Prelude.html#t:Float">Float</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Int.html#t:Int">Int</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Int.html#t:Int8">Int8</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Int.html#t:Int16">Int16</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Int.html#t:Int32">Int32</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Int.html#t:Int64">Int64</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Prelude.html#t:Integer">Integer</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Word.html#t:Word">Word</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Word.html#t:Word8">Word8</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Word.html#t:Word16">Word16</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Word.html#t:Word32">Word32</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> <a href="Data-Word.html#t:Word64">Word64</a></td><td class="doc empty">&nbsp;</td></tr><tr><td class="src"><a href="Text-Printf.html#t:IsChar">IsChar</a> c =&gt; <a href="Text-Printf.html#t:PrintfArg">PrintfArg</a> [c]</td><td class="doc empty">&nbsp;</td></tr></table></div></div></div><div class="top"><p class="src"><span class="keyword">class</span>  <a name="t:IsChar" class="def">IsChar</a> c </p><div class="subs instances"><p id="control.i:IsChar" class="caption collapser" onclick="toggleSection('i:IsChar')">Instances</p><div id="section.i:IsChar" class="show"><table><tr><td class="src"><a href="Text-Printf.html#t:IsChar">IsChar</a> <a href="Data-Char.html#t:Char">Char</a></td><td class="doc empty">&nbsp;</td></tr></table></div></div></div></div></div><div id="footer"><p>Produced by <a href="http://www.haskell.org/haddock/">Haddock</a> version 2.11.0</p></div></body></html>