==========Standard C String and Character==========

|[[atof]]|converts a string to a double|
|[[atoi]]|converts a string to an integer|
|[[atol]]|converts a string to a long|
|[[isalnum]]|true if a character is alphanumeric|
|[[isalpha]]|true if a character is alphabetic|
|[[iscntrl]]|true if a character is a control character|
|[[isdigit]]|true if a character is a digit|
|[[isgraph]]|true if a character is a graphical character|
|[[islower]]|true if a character is lowercase|
|[[isprint]]|true if a character is a printing character|
|[[ispunct]]|true if a character is punctuation|
|[[isspace]]|true if a character is a space character|
|[[isupper]]|true if a character is an uppercase character|
|[[isxdigit]]|true if a character is a hexadecimal character|
|[[memchr]]|searches an array for the first occurrence of a character|
|[[memcmp]]|compares two buffers|
|[[memcpy]]|copies one buffer to another|
|[[memmove]]|moves one buffer to another|
|[[memset]]|fills a buffer with a character|
|[[strcat]]|concatenates two strings|
|[[strchr]]|finds the first occurrence of a character in a string|
|[[strcmp]]|compares two strings|
|[[strcoll]]|compares two strings in accordance to the current locale|
|[[strcpy]]|copies one string to another|
|[[strcspn]]|searches one string for any characters in another|
|[[strerror]]|returns a text version of a given error code|
|[[strlen]]|returns the length of a given string|
|[[strncat]]|concatenates a certain amount of characters of two strings|
|[[strncmp]]|compares a certain amount of characters of two strings|
|[[strncpy]]|copies a certain amount of characters from one string to another|
|[[strpbrk]]|finds the first location of any character in one string, in another string|
|[[strrchr]]|finds the last occurrence of a character in a string|
|[[strspn]]|returns the length of a substring of characters of a string|
|[[strstr]]|finds the first occurrence of a substring of characters|
|[[strtod]]|converts a string to a double|
|[[strtok]]|finds the next token in a string|
|[[strtol]]|converts a string to a long|
|[[strtoul]]|converts a string to an unsigned long|
|[[strxfrm]]|converts a substring so that it can be used by string comparison functions|
|[[tolower]]|converts a character to lowercase|
|[[toupper]]|converts a character to uppercase|