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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head> <meta name="generator" content= "HTML Tidy for Linux/x86 (vers 1 September 2005), see www.w3.org"> <title>All C Functions</title> <link href="cppreference.css" rel="stylesheet" type="text/css"></head><body><table> <tr> <td> <div class="body-content"> <div class="header-box"> <a href="index.html">cppreference.com</a> > All C Functions </div> <div class="name-format"> All C Functions </div> <table class="category-table"> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "preprocessor/sharp.html">#, ##</a></td> <td class="category-table-td">manipulate strings</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "preprocessor/define.html">#define</a></td> <td class="category-table-td">define variables</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "preprocessor/error.html">#error</a></td> <td class="category-table-td">display an error message</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "preprocessor/preprocessor_if.html">#if, #ifdef, #ifndef, #else, #elif, #endif</a></td> <td class="category-table-td">conditional operators</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "preprocessor/include.html">#include</a></td> <td class="category-table-td">insert the contents of another file</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "preprocessor/line.html">#line</a></td> <td class="category-table-td">set line and file information</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "preprocessor/pragma.html">#pragma</a></td> <td class="category-table-td">implementation specific command</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "preprocessor/undef.html">#undef</a></td> <td class="category-table-td">used to undefine variables</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "preprocessor/preprocessor_vars.html">Predefined preprocessor variables</a></td> <td class="category-table-td">miscellaneous preprocessor variables</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdother/abort.html">abort</a></td> <td class="category-table-td">stops the program</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdmath/abs.html">abs</a></td> <td class="category-table-td">absolute value</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdmath/acos.html">acos</a></td> <td class="category-table-td">arc cosine</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stddate/asctime.html">asctime</a></td> <td class="category-table-td">a textual version of the time</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdmath/asin.html">asin</a></td> <td class="category-table-td">arc sine</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdother/assert.html">assert</a></td> <td class="category-table-td">stops the program if an expression isn't true</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdmath/atan.html">atan</a></td> <td class="category-table-td">arc tangent</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdmath/atan2.html">atan2</a></td> <td class="category-table-td">arc tangent, using signs to determine quadrants</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdother/atexit.html">atexit</a></td> <td class="category-table-td">sets a function to be called when the program exits</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdstring/atof.html">atof</a></td> <td class="category-table-td">converts a string to a double</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdstring/atoi.html">atoi</a></td> <td class="category-table-td">converts a string to an integer</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdstring/atol.html">atol</a></td> <td class="category-table-td">converts a string to a long</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdother/bsearch.html">bsearch</a></td> <td class="category-table-td">perform a binary search</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdmem/calloc.html">calloc</a></td> <td class="category-table-td">allocates and clears a two-dimensional chunk of memory</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdmath/ceil.html">ceil</a></td> <td class="category-table-td">the smallest integer not less than a certain value</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdio/clearerr.html">clearerr</a></td> <td class="category-table-td">clears errors</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stddate/clock.html">clock</a></td> <td class="category-table-td">returns the amount of time that the program has been running</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdmath/cos.html">cos</a></td> <td class="category-table-td">cosine</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdmath/cosh.html">cosh</a></td> <td class="category-table-td">hyperbolic cosine</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stddate/ctime.html">ctime</a></td> <td class="category-table-td">returns a specifically formatted version of the time</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stddate/difftime.html">difftime</a></td> <td class="category-table-td">the difference between two times</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdmath/div.html">div</a></td> <td class="category-table-td">returns the quotient and remainder of a division</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdother/exit.html">exit</a></td> <td class="category-table-td">stop the program</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdmath/exp.html">exp</a></td> <td class="category-table-td">returns "e" raised to a given power</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdmath/fabs.html">fabs</a></td> <td class="category-table-td">absolute value for floating-point numbers</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdio/fclose.html">fclose</a></td> <td class="category-table-td">close a file</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdio/feof.html">feof</a></td> <td class="category-table-td">true if at the end-of-file</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdio/ferror.html">ferror</a></td> <td class="category-table-td">checks for a file error</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdio/fflush.html">fflush</a></td> <td class="category-table-td">writes the contents of the output buffer</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdio/fgetc.html">fgetc</a></td> <td class="category-table-td">get a character from a stream</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdio/fgetpos.html">fgetpos</a></td> <td class="category-table-td">get the file position indicator</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdio/fgets.html">fgets</a></td> <td class="category-table-td">get a string of characters from a stream</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdmath/floor.html">floor</a></td> <td class="category-table-td">returns the largest integer not greater than a given value</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdmath/fmod.html">fmod</a></td> <td class="category-table-td">returns the remainder of a division</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdio/fopen.html">fopen</a></td> <td class="category-table-td">open a file</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdio/fprintf.html">fprintf</a></td> <td class="category-table-td">print formatted output to a file</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "stdio/fputc.html">fputc</a></td> <td class="category-table-td">write a character to a file</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "stdio/fputs.html">fputs</a></td> <td class="category-table-td">write a string to a file</td> </tr> <tr class="category-table-tr-1">⌨️ 快捷键说明
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