您最多选择25个主题 主题必须以字母或数字开头,可以包含连字符 (-),并且长度不得超过35个字符

98 行
4.0KB

  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>Initializers (Using the GNU Compiler Collection (GCC))</title>
  21. <meta name="description" content="Initializers (Using the GNU Compiler Collection (GCC))">
  22. <meta name="keywords" content="Initializers (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="Compound-Literals.html#Compound-Literals" rel="next" title="Compound Literals">
  31. <link href="Pointers-to-Arrays.html#Pointers-to-Arrays" rel="prev" title="Pointers to Arrays">
  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="Initializers"></a>
  62. <div class="header">
  63. <p>
  64. Next: <a href="Compound-Literals.html#Compound-Literals" accesskey="n" rel="next">Compound Literals</a>, Previous: <a href="Pointers-to-Arrays.html#Pointers-to-Arrays" accesskey="p" rel="prev">Pointers to Arrays</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="Non_002dConstant-Initializers"></a>
  68. <h3 class="section">6.27 Non-Constant Initializers</h3>
  69. <a name="index-initializers_002c-non_002dconstant"></a>
  70. <a name="index-non_002dconstant-initializers"></a>
  71. <p>As in standard C++ and ISO C99, the elements of an aggregate initializer for an
  72. automatic variable are not required to be constant expressions in GNU C.
  73. Here is an example of an initializer with run-time varying elements:
  74. </p>
  75. <div class="smallexample">
  76. <pre class="smallexample">foo (float f, float g)
  77. {
  78. float beat_freqs[2] = { f-g, f+g };
  79. /* <span class="roman">&hellip;</span> */
  80. }
  81. </pre></div>
  82. </body>
  83. </html>