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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>Standard C String and Character</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> > <a href= "index.html">Standard C String and Character</a> </div> <div class="name-format"> Standard C String and Character </div> <p><a href="all.html">Display all entries</a> for Standard C String and Character on one page, or view entries individually:</p> <table class="category-table"> <tr class="category-table-tr-2"> <td class="category-table-td"><a href="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="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="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= "isalnum.html">isalnum</a></td> <td class="category-table-td">true if a character is alphanumeric</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "isalpha.html">isalpha</a></td> <td class="category-table-td">true if a character is alphabetic</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "iscntrl.html">iscntrl</a></td> <td class="category-table-td">true if a character is a control character</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "isdigit.html">isdigit</a></td> <td class="category-table-td">true if a character is a digit</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "isgraph.html">isgraph</a></td> <td class="category-table-td">true if a character is a graphical character</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "islower.html">islower</a></td> <td class="category-table-td">true if a character is lowercase</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "isprint.html">isprint</a></td> <td class="category-table-td">true if a character is a printing character</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "ispunct.html">ispunct</a></td> <td class="category-table-td">true if a character is punctuation</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "isspace.html">isspace</a></td> <td class="category-table-td">true if a character is a space character</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "isupper.html">isupper</a></td> <td class="category-table-td">true if a character is an uppercase character</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "isxdigit.html">isxdigit</a></td> <td class="category-table-td">true if a character is a hexidecimal character</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "memchr.html">memchr</a></td> <td class="category-table-td">searches an array for the first occurance of a character</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "memcmp.html">memcmp</a></td> <td class="category-table-td">compares two buffers</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "memcpy.html">memcpy</a></td> <td class="category-table-td">copies one buffer to another</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "memmove.html">memmove</a></td> <td class="category-table-td">moves one buffer to another</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "memset.html">memset</a></td> <td class="category-table-td">fills a buffer with a character</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "strcat.html">strcat</a></td> <td class="category-table-td">concatenates two strings</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "strchr.html">strchr</a></td> <td class="category-table-td">finds the first occurance of a character in a string</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "strcmp.html">strcmp</a></td> <td class="category-table-td">compares two strings</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "strcoll.html">strcoll</a></td> <td class="category-table-td">compares two strings in accordance to the current locale</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "strcpy.html">strcpy</a></td> <td class="category-table-td">copies one string to another</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "strcspn.html">strcspn</a></td> <td class="category-table-td">searches one string for any characters in another</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "strerror.html">strerror</a></td> <td class="category-table-td">returns a text version of a given error code</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "strlen.html">strlen</a></td> <td class="category-table-td">returns the length of a given string</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "strncat.html">strncat</a></td> <td class="category-table-td">concatenates a certain amount of characters of two strings</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "strncmp.html">strncmp</a></td> <td class="category-table-td">compares a certain amount of characters of two strings</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "strncpy.html">strncpy</a></td> <td class="category-table-td">copies a certain amount of characters from one string to another</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "strpbrk.html">strpbrk</a></td> <td class="category-table-td">finds the first location of any character in one string, in another string</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "strrchr.html">strrchr</a></td> <td class="category-table-td">finds the last occurance of a character in a string</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "strspn.html">strspn</a></td> <td class="category-table-td">returns the length of a substring of characters of a string</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "strstr.html">strstr</a></td> <td class="category-table-td">finds the first occurance of a substring of characters</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "strtod.html">strtod</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= "strtok.html">strtok</a></td> <td class="category-table-td">finds the next token in a string</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "strtol.html">strtol</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= "strtoul.html">strtoul</a></td> <td class="category-table-td">converts a string to an unsigned long</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "strxfrm.html">strxfrm</a></td> <td class="category-table-td">converts a substring so that it can be used by string comparison functions</td> </tr> <tr class="category-table-tr-1"> <td class="category-table-td"><a href= "tolower.html">tolower</a></td> <td class="category-table-td">converts a character to lowercase</td> </tr> <tr class="category-table-tr-2"> <td class="category-table-td"><a href= "toupper.html">toupper</a></td> <td class="category-table-td">converts a character to uppercase</td> </tr> </table> </div> </td> </tr> </table></body></html>⌨️ 快捷键说明
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