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3 年之前
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  47. <a name="puts"></a>
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  53. <a name="puts_002d_002d_002dwrite-a-character-string"></a>
  54. <h3 class="section">4.49 <code>puts</code>&mdash;write a character string</h3>
  55. <a name="index-puts"></a>
  56. <a name="index-_005fputs_005fr"></a>
  57. <p><strong>Synopsis</strong>
  58. </p><div class="example">
  59. <pre class="example">#include &lt;stdio.h&gt;
  60. int puts(const char *<var>s</var>);
  61. int _puts_r(struct _reent *<var>reent</var>, const char *<var>s</var>);
  62. </pre></div>
  63. <p><strong>Description</strong><br>
  64. <code>puts</code> writes the string at <var>s</var> (followed by a newline, instead of
  65. the trailing null) to the standard output stream.
  66. </p>
  67. <p>The alternate function <code>_puts_r</code> is a reentrant version. The extra
  68. argument <var>reent</var> is a pointer to a reentrancy structure.
  69. </p>
  70. <br>
  71. <p><strong>Returns</strong><br>
  72. If successful, the result is a nonnegative integer; otherwise, the
  73. result is <code>EOF</code>.
  74. </p>
  75. <br>
  76. <p><strong>Portability</strong><br>
  77. ANSI C requires <code>puts</code>, but does not specify that the result on
  78. success must be <code>0</code>; any non-negative value is permitted.
  79. </p>
  80. <p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
  81. <code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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