lang/C/the.ansi.c.programming.language/notes.accompany.ansi.c/sx10b.html

   1 <!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
   2 <!-- This collection of hypertext pages is Copyright 1995, 1996 by Steve Summit. -->
   3 <!-- This material may be freely redistributed and used -->
   4 <!-- but may not be republished or sold without permission. -->
   5 <html>
   6 <head>
   7 <link rev="owner" href="mailto:scs@eskimo.com">
   8 <link rev="made" href="mailto:scs@eskimo.com">
   9 <title>section 7.2: Formatted Output -- Printf</title>
  10 <link href="sx10a.html" rev=precedes>
  11 <link href="sx10c.html" rel=precedes>
  12 <link href="sx10.html" rev=subdocument>
  13 </head>
  14 <body>
  15 <H2>section 7.2: Formatted Output -- Printf</H2>
  16
  17 pages 153-155
  18 <p>To summarize the important points of this section:
  19 <UL><li><TT>printf</TT>'s output goes to the standard output,
  20 just like <TT>putchar</TT>.
  21 <li>Everything in <TT>printf</TT>'s format string
  22 is either
  23 a plain character to be printed as-is,
  24 or a <TT>%</TT>-specifier which
  25 generally
  26 causes one
  27 argument to be consumed, formatted, and printed.
  28 (Occasionally,
  29 a single <TT>%</TT>-specifier consumes
  30 two or three arguments if the width or precision is <TT>*</TT>,
  31 or zero arguments if the specifier is <TT>%%</TT>.)
  32 <li>There's a fairly long list of conversion specifiers;
  33 see the table on page 154.
  34 <li>Always be careful that the conversions you request
  35 (in the format string)
  36 match the arguments you supply.
  37 <li>You can ``print'' to a string
  38 (instead of the standard output)
  39 with <TT>sprintf</TT>.
  40 (This is the usual way of converting numbers to strings in C;
  41 the <TT>itoa</TT> function we were playing with
  42 in section 3.6 on page 64
  43 is nonstandard, and unnecessary.)
  44 </UL></p><hr>
  45 <p>
  46 Read sequentially:
  47 <a href="sx10a.html" rev=precedes>prev</a>
  48 <a href="sx10c.html" rel=precedes>next</a>
  49 <a href="sx10.html" rev=subdocument>up</a>
  50 <a href="top.html">top</a>
  51 </p>
  52 <p>
  53 This page by <a href="http://www.eskimo.com/~scs/">Steve Summit</a>
  54 // <a href="copyright.html">Copyright</a> 1995, 1996
  55 // <a href="mailto:scs@eskimo.com">mail feedback</a>
  56 </p>
  57 </body>
  58 </html>