Standard C String and Character

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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 hexidecimal character
memchr searches an array for the first occurance 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 occurance 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 occurance of a character in a string
strspn returns the length of a substring of characters of a string
strstr finds the first occurance 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