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  30. <h2 class="sectionedit1"><a name="preprocessor_commands" id="preprocessor_commands">Preprocessor Commands</a></h2>
  31. <div class="level2">
  32. <p>
  33. The C++ preprocessor runs before any other compilation happens. Commands given to the preprocessor allow the programmer to define variables, perform text substitution, and test simple conditions.
  34. </p>
  35. <div class="table sectionedit2"><table class="inline">
  36. <tr class="row0">
  37. <td class="col0"><a href="sharp" class="wikilink1" title="preprocessor:sharp"># and ##</a></td><td class="col1">manipulate strings</td>
  38. </tr>
  39. <tr class="row1">
  40. <td class="col0"><a href="define" class="wikilink1" title="preprocessor:define">#define</a></td><td class="col1">define macrodefinition</td>
  41. </tr>
  42. <tr class="row2">
  43. <td class="col0"><a href="error" class="wikilink1" title="preprocessor:error">#error</a></td><td class="col1">display an error message</td>
  44. </tr>
  45. <tr class="row3">
  46. <td class="col0"><a href="preprocessor_if" class="wikilink1" title="preprocessor:preprocessor_if">#if, #ifdef, #ifndef, #else, #elif, and #endif</a></td><td class="col1">conditional operators</td>
  47. </tr>
  48. <tr class="row4">
  49. <td class="col0"><a href="include" class="wikilink1" title="preprocessor:include">#include</a></td><td class="col1">insert the contents of another file</td>
  50. </tr>
  51. <tr class="row5">
  52. <td class="col0"><a href="line" class="wikilink1" title="preprocessor:line">#line</a></td><td class="col1">set line and file information</td>
  53. </tr>
  54. <tr class="row6">
  55. <td class="col0"><a href="pragma" class="wikilink1" title="preprocessor:pragma">#pragma</a></td><td class="col1">implementation specific command</td>
  56. </tr>
  57. <tr class="row7">
  58. <td class="col0"><a href="undef" class="wikilink1" title="preprocessor:undef">#undef</a></td><td class="col1">used to undefine macrodefinitions</td>
  59. </tr>
  60. <tr class="row8">
  61. <td class="col0"><a href="warning" class="wikilink1" title="preprocessor:warning">#warning</a></td><td class="col1">display a warning message</td>
  62. </tr>
  63. <tr class="row9">
  64. <td class="col0"><a href="preprocessor_vars" class="wikilink1" title="preprocessor:preprocessor_vars">Predefined preprocessor variables</a></td><td class="col1">miscellaneous preprocessor variables</td>
  65. </tr>
  66. </table></div>
  67. <!-- EDIT2 TABLE [233-807] -->
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