選択できるのは25トピックまでです。 トピックは、先頭が英数字で、英数字とダッシュ('-')を使用した35文字以内のものにしてください。

116 行
4.4KB

  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
  2. <html>
  3. <!-- Copyright (C) 1988-2020 Free Software Foundation, Inc.
  4. Permission is granted to copy, distribute and/or modify this document
  5. under the terms of the GNU Free Documentation License, Version 1.3 or
  6. any later version published by the Free Software Foundation; with the
  7. Invariant Sections being "Funding Free Software", the Front-Cover
  8. Texts being (a) (see below), and with the Back-Cover Texts being (b)
  9. (see below). A copy of the license is included in the section entitled
  10. "GNU Free Documentation License".
  11. (a) The FSF's Front-Cover Text is:
  12. A GNU Manual
  13. (b) The FSF's Back-Cover Text is:
  14. You have freedom to copy and modify this GNU Manual, like GNU
  15. software. Copies published by the Free Software Foundation raise
  16. funds for GNU development. -->
  17. <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->
  18. <head>
  19. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
  20. <title>Case Ranges (Using the GNU Compiler Collection (GCC))</title>
  21. <meta name="description" content="Case Ranges (Using the GNU Compiler Collection (GCC))">
  22. <meta name="keywords" content="Case Ranges (Using the GNU Compiler Collection (GCC))">
  23. <meta name="resource-type" content="document">
  24. <meta name="distribution" content="global">
  25. <meta name="Generator" content="makeinfo">
  26. <link href="index.html#Top" rel="start" title="Top">
  27. <link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
  28. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
  29. <link href="C-Extensions.html#C-Extensions" rel="up" title="C Extensions">
  30. <link href="Cast-to-Union.html#Cast-to-Union" rel="next" title="Cast to Union">
  31. <link href="Designated-Inits.html#Designated-Inits" rel="prev" title="Designated Inits">
  32. <style type="text/css">
  33. <!--
  34. a.summary-letter {text-decoration: none}
  35. blockquote.indentedblock {margin-right: 0em}
  36. blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
  37. blockquote.smallquotation {font-size: smaller}
  38. div.display {margin-left: 3.2em}
  39. div.example {margin-left: 3.2em}
  40. div.lisp {margin-left: 3.2em}
  41. div.smalldisplay {margin-left: 3.2em}
  42. div.smallexample {margin-left: 3.2em}
  43. div.smalllisp {margin-left: 3.2em}
  44. kbd {font-style: oblique}
  45. pre.display {font-family: inherit}
  46. pre.format {font-family: inherit}
  47. pre.menu-comment {font-family: serif}
  48. pre.menu-preformatted {font-family: serif}
  49. pre.smalldisplay {font-family: inherit; font-size: smaller}
  50. pre.smallexample {font-size: smaller}
  51. pre.smallformat {font-family: inherit; font-size: smaller}
  52. pre.smalllisp {font-size: smaller}
  53. span.nolinebreak {white-space: nowrap}
  54. span.roman {font-family: initial; font-weight: normal}
  55. span.sansserif {font-family: sans-serif; font-weight: normal}
  56. ul.no-bullet {list-style: none}
  57. -->
  58. </style>
  59. </head>
  60. <body lang="en">
  61. <a name="Case-Ranges"></a>
  62. <div class="header">
  63. <p>
  64. Next: <a href="Cast-to-Union.html#Cast-to-Union" accesskey="n" rel="next">Cast to Union</a>, Previous: <a href="Designated-Inits.html#Designated-Inits" accesskey="p" rel="prev">Designated Inits</a>, Up: <a href="C-Extensions.html#C-Extensions" accesskey="u" rel="up">C Extensions</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
  65. </div>
  66. <hr>
  67. <a name="Case-Ranges-1"></a>
  68. <h3 class="section">6.30 Case Ranges</h3>
  69. <a name="index-case-ranges"></a>
  70. <a name="index-ranges-in-case-statements"></a>
  71. <p>You can specify a range of consecutive values in a single <code>case</code> label,
  72. like this:
  73. </p>
  74. <div class="smallexample">
  75. <pre class="smallexample">case <var>low</var> ... <var>high</var>:
  76. </pre></div>
  77. <p>This has the same effect as the proper number of individual <code>case</code>
  78. labels, one for each integer value from <var>low</var> to <var>high</var>, inclusive.
  79. </p>
  80. <p>This feature is especially useful for ranges of ASCII character codes:
  81. </p>
  82. <div class="smallexample">
  83. <pre class="smallexample">case 'A' ... 'Z':
  84. </pre></div>
  85. <p><strong>Be careful:</strong> Write spaces around the <code>...</code>, for otherwise
  86. it may be parsed wrong when you use it with integer values. For example,
  87. write this:
  88. </p>
  89. <div class="smallexample">
  90. <pre class="smallexample">case 1 ... 5:
  91. </pre></div>
  92. <p>rather than this:
  93. </p>
  94. <div class="smallexample">
  95. <pre class="smallexample">case 1...5:
  96. </pre></div>
  97. </body>
  98. </html>