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  8.     Standard C I/O    [C++ Reference]
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  38.       <span class="bchead">You are here: </span><a href="../../start.html"  title="start">C++ Reference</a> &raquo; <a href="../../c/start.html"  title="c:start">The Standard C Library</a> &raquo; <a href="../../c/io/start.html"  title="c:io:start">Standard C I/O</a>    </div>
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  56. 

  57. <h1><a name="standard_c_io" id="standard_c_io">Standard C I/O</a></h1>
    58. 

  58. <div class="level1">
    59. 

  59. 

  60. <p>
    61. 

  61. 

  62. These functions provide an alternative to the <a href="../../io/start.html" class="wikilink1" title="io:start">C++ stream-based IO classes</a>.  
    63. 

  63. 

  64. </p>
    65. 

  65. <table class="inline">
    66. 

  66. 	<tr class="row0">
    67. 

  67. 		<td class="col0"><a href="../../c/io/clearerr.html" class="wikilink1" title="c:io:clearerr">clearerr</a></td><td class="col1">clears errors</td>
    68. 

  68. 	</tr>
    69. 

  69. 	<tr class="row1">
    70. 

  70. 		<td class="col0"><a href="../../c/io/fclose.html" class="wikilink1" title="c:io:fclose">fclose</a></td><td class="col1">close a file</td>
    71. 

  71. 	</tr>
    72. 

  72. 	<tr class="row2">
    73. 

  73. 		<td class="col0"><a href="../../c/io/feof.html" class="wikilink1" title="c:io:feof">feof</a></td><td class="col1">true if at the end-of-file</td>
    74. 

  74. 	</tr>
    75. 

  75. 	<tr class="row3">
    76. 

  76. 		<td class="col0"><a href="../../c/io/ferror.html" class="wikilink1" title="c:io:ferror">ferror</a></td><td class="col1">checks for a file error</td>
    77. 

  77. 	</tr>
    78. 

  78. 	<tr class="row4">
    79. 

  79. 		<td class="col0"><a href="../../c/io/fflush.html" class="wikilink1" title="c:io:fflush">fflush</a></td><td class="col1">writes the contents of the output buffer</td>
    80. 

  80. 	</tr>
    81. 

  81. 	<tr class="row5">
    82. 

  82. 		<td class="col0"><a href="../../c/io/fgetc.html" class="wikilink1" title="c:io:fgetc">fgetc</a></td><td class="col1">get a character from a stream</td>
    83. 

  83. 	</tr>
    84. 

  84. 	<tr class="row6">
    85. 

  85. 		<td class="col0"><a href="../../c/io/fgetpos.html" class="wikilink1" title="c:io:fgetpos">fgetpos</a></td><td class="col1">get the file position indicator</td>
    86. 

  86. 	</tr>
    87. 

  87. 	<tr class="row7">
    88. 

  88. 		<td class="col0"><a href="../../c/io/fgets.html" class="wikilink1" title="c:io:fgets">fgets</a></td><td class="col1">get a string of characters from a stream</td>
    89. 

  89. 	</tr>
    90. 

  90. 	<tr class="row8">
    91. 

  91. 		<td class="col0"><a href="../../c/io/fopen.html" class="wikilink1" title="c:io:fopen">fopen</a></td><td class="col1">open a file</td>
    92. 

  92. 	</tr>
    93. 

  93. 	<tr class="row9">
    94. 

  94. 		<td class="col0"><a href="../../c/io/fprintf.html" class="wikilink1" title="c:io:fprintf">fprintf</a></td><td class="col1">print formatted output to a file</td>
    95. 

  95. 	</tr>
    96. 

  96. 	<tr class="row10">
    97. 

  97. 		<td class="col0"><a href="../../c/io/fputc.html" class="wikilink1" title="c:io:fputc">fputc</a></td><td class="col1">write a character to a file</td>
    98. 

  98. 	</tr>
    99. 

  99. 	<tr class="row11">
    100. 

  100. 		<td class="col0"><a href="../../c/io/fputs.html" class="wikilink1" title="c:io:fputs">fputs</a></td><td class="col1">write a string to a file</td>
    101. 

  101. 	</tr>
    102. 

  102. 	<tr class="row12">
    103. 

  103. 		<td class="col0"><a href="../../c/io/fread.html" class="wikilink1" title="c:io:fread">fread</a></td><td class="col1">read from a file</td>
    104. 

  104. 	</tr>
    105. 

  105. 	<tr class="row13">
    106. 

  106. 		<td class="col0"><a href="../../c/io/freopen.html" class="wikilink1" title="c:io:freopen">freopen</a></td><td class="col1">open an existing stream with a different name</td>
    107. 

  107. 	</tr>
    108. 

  108. 	<tr class="row14">
    109. 

  109. 		<td class="col0"><a href="../../c/io/fscanf.html" class="wikilink1" title="c:io:fscanf">fscanf</a></td><td class="col1">read formatted input from a file</td>
    110. 

  110. 	</tr>
    111. 

  111. 	<tr class="row15">
    112. 

  112. 		<td class="col0"><a href="../../c/io/fseek.html" class="wikilink1" title="c:io:fseek">fseek</a></td><td class="col1">move to a specific location in a file</td>
    113. 

  113. 	</tr>
    114. 

  114. 	<tr class="row16">
    115. 

  115. 		<td class="col0"><a href="../../c/io/fsetpos.html" class="wikilink1" title="c:io:fsetpos">fsetpos</a></td><td class="col1">move to a specific location in a file</td>
    116. 

  116. 	</tr>
    117. 

  117. 	<tr class="row17">
    118. 

  118. 		<td class="col0"><a href="../../c/io/ftell.html" class="wikilink1" title="c:io:ftell">ftell</a></td><td class="col1">returns the current file position indicator</td>
    119. 

  119. 	</tr>
    120. 

  120. 	<tr class="row18">
    121. 

  121. 		<td class="col0"><a href="../../c/io/fwrite.html" class="wikilink1" title="c:io:fwrite">fwrite</a></td><td class="col1">write to a file</td>
    122. 

  122. 	</tr>
    123. 

  123. 	<tr class="row19">
    124. 

  124. 		<td class="col0"><a href="../../c/io/getc.html" class="wikilink1" title="c:io:getc">getc</a></td><td class="col1">read a character from a file</td>
    125. 

  125. 	</tr>
    126. 

  126. 	<tr class="row20">
    127. 

  127. 		<td class="col0"><a href="../../c/io/getchar.html" class="wikilink1" title="c:io:getchar">getchar</a></td><td class="col1">read a character from stdin</td>
    128. 

  128. 	</tr>
    129. 

  129. 	<tr class="row21">
    130. 

  130. 		<td class="col0"><a href="../../c/io/gets.html" class="wikilink1" title="c:io:gets">gets</a></td><td class="col1">read a string from stdin</td>
    131. 

  131. 	</tr>
    132. 

  132. 	<tr class="row22">
    133. 

  133. 		<td class="col0"><a href="../../c/io/perror.html" class="wikilink1" title="c:io:perror">perror</a></td><td class="col1">displays a string version of the current error to stderr</td>
    134. 

  134. 	</tr>
    135. 

  135. 	<tr class="row23">
    136. 

  136. 		<td class="col0"><a href="../../c/io/printf.html" class="wikilink1" title="c:io:printf">printf</a></td><td class="col1">write formatted output to stdout</td>
    137. 

  137. 	</tr>
    138. 

  138. 	<tr class="row24">
    139. 

  139. 		<td class="col0"><a href="../../c/io/putc.html" class="wikilink1" title="c:io:putc">putc</a></td><td class="col1">write a character to a stream</td>
    140. 

  140. 	</tr>
    141. 

  141. 	<tr class="row25">
    142. 

  142. 		<td class="col0"><a href="../../c/io/putchar.html" class="wikilink1" title="c:io:putchar">putchar</a></td><td class="col1">write a character to stdout</td>
    143. 

  143. 	</tr>
    144. 

  144. 	<tr class="row26">
    145. 

  145. 		<td class="col0"><a href="../../c/io/puts.html" class="wikilink1" title="c:io:puts">puts</a></td><td class="col1">write a string to stdout</td>
    146. 

  146. 	</tr>
    147. 

  147. 	<tr class="row27">
    148. 

  148. 		<td class="col0"><a href="../../c/io/remove.html" class="wikilink1" title="c:io:remove">remove</a></td><td class="col1">erase a file</td>
    149. 

  149. 	</tr>
    150. 

  150. 	<tr class="row28">
    151. 

  151. 		<td class="col0"><a href="../../c/io/rename.html" class="wikilink1" title="c:io:rename">rename</a></td><td class="col1">rename a file</td>
    152. 

  152. 	</tr>
    153. 

  153. 	<tr class="row29">
    154. 

  154. 		<td class="col0"><a href="../../c/io/rewind.html" class="wikilink1" title="c:io:rewind">rewind</a></td><td class="col1">move the file position indicator to the beginning of a file</td>
    155. 

  155. 	</tr>
    156. 

  156. 	<tr class="row30">
    157. 

  157. 		<td class="col0"><a href="../../c/io/scanf.html" class="wikilink1" title="c:io:scanf">scanf</a></td><td class="col1">read formatted input from stdin</td>
    158. 

  158. 	</tr>
    159. 

  159. 	<tr class="row31">
    160. 

  160. 		<td class="col0"><a href="../../c/io/setbuf.html" class="wikilink1" title="c:io:setbuf">setbuf</a></td><td class="col1">set the buffer for a specific stream</td>
    161. 

  161. 	</tr>
    162. 

  162. 	<tr class="row32">
    163. 

  163. 		<td class="col0"><a href="../../c/io/setvbuf.html" class="wikilink1" title="c:io:setvbuf">setvbuf</a></td><td class="col1">set the buffer and size for a specific stream</td>
    164. 

  164. 	</tr>
    165. 

  165. 	<tr class="row33">
    166. 

  166. 		<td class="col0"><a href="../../c/io/snprintf.html" class="wikilink1" title="c:io:snprintf">snprintf</a></td><td class="col1">write formated output to a buffer (with bound checking)</td>
    167. 

  167. 	</tr>
    168. 

  168. 	<tr class="row34">
    169. 

  169. 		<td class="col0"><a href="../../c/io/sprintf.html" class="wikilink1" title="c:io:sprintf">sprintf</a></td><td class="col1">write formatted output to a buffer</td>
    170. 

  170. 	</tr>
    171. 

  171. 	<tr class="row35">
    172. 

  172. 		<td class="col0"><a href="../../c/io/sscanf.html" class="wikilink1" title="c:io:sscanf">sscanf</a></td><td class="col1">read formatted input from a buffer</td>
    173. 

  173. 	</tr>
    174. 

  174. 	<tr class="row36">
    175. 

  175. 		<td class="col0"><a href="../../c/io/tmpfile.html" class="wikilink1" title="c:io:tmpfile">tmpfile</a></td><td class="col1">return a pointer to a temporary file</td>
    176. 

  176. 	</tr>
    177. 

  177. 	<tr class="row37">
    178. 

  178. 		<td class="col0"><a href="../../c/io/tmpnam.html" class="wikilink1" title="c:io:tmpnam">tmpnam</a></td><td class="col1">return a unique filename</td>
    179. 

  179. 	</tr>
    180. 

  180. 	<tr class="row38">
    181. 

  181. 		<td class="col0"><a href="../../c/io/ungetc.html" class="wikilink1" title="c:io:ungetc">ungetc</a></td><td class="col1">puts a character back into a stream</td>
    182. 

  182. 	</tr>
    183. 

  183. 	<tr class="row39">
    184. 

  184. 		<td class="col0"><a href="../../c/io/vprintf_vfprintf_vsprintf.html" class="wikilink1" title="c:io:vprintf_vfprintf_vsprintf">vprintf, vfprintf, and vsprintf</a></td><td class="col1">write formatted output with variable argument lists</td>
    185. 

  185. 	</tr>
    186. 

  186. 	<tr class="row40">
    187. 

  187. 		<td class="col0"><a href="../../c/io/vscanf_vfscanf_vsscanf.html" class="wikilink1" title="c:io:vscanf_vfscanf_vsscanf">vscanf, vfscanf, and vsscanf</a></td><td class="col1">gets formatted input from stdin with variable argument lists</td>
    188. 

  188. 	</tr>
    189. 

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    190. 

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