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Showing content from https://en.cppreference.com/w/cpp/language/../string/byte.html below:

Null-terminated byte strings - cppreference.com

Null-terminated byte strings

A null-terminated byte string (NTBS) is a possibly empty sequence of nonzero bytes followed by a byte with value zero (the terminating null character). Each byte in a byte string encodes one character of some character set. For example, the character array {'\x63', '\x61', '\x74', '\0'} is an NTBS holding the string "cat" in ASCII encoding.

[edit] Functions Character classification checks if a character is alphanumeric
(function) [edit] checks if a character is alphabetic
(function) [edit] checks if a character is lowercase
(function) [edit] checks if a character is an uppercase character
(function) [edit] checks if a character is a digit
(function) [edit] checks if a character is a hexadecimal character
(function) [edit] checks if a character is a control character
(function) [edit] checks if a character is a graphical character
(function) [edit] checks if a character is a space character
(function) [edit] checks if a character is a blank character
(function) [edit] checks if a character is a printing character
(function) [edit] checks if a character is a punctuation character
(function) [edit] Character manipulation converts a character to lowercase
(function) [edit] converts a character to uppercase
(function) [edit] ASCII values characters

iscntrl
iswcntrl

isprint
iswprint

isspace
iswspace

isblank
iswblank

isgraph
iswgraph

ispunct
iswpunct

isalnum
iswalnum

isalpha
iswalpha

isupper
iswupper

islower
iswlower

isdigit
iswdigit

isxdigit
iswxdigit

decimal hexadecimal octal 0–8 \x0–\x8 \0–\10 control codes (NUL, etc.) ≠0 0 0 0 0 0 0 0 0 0 0 0 9 \x9 \11 tab (\t) ≠0 0 ≠0 ≠0 0 0 0 0 0 0 0 0 10–13 \xA–\xD \12–\15 whitespaces (\n, \v, \f, \r) ≠0 0 ≠0 0 0 0 0 0 0 0 0 0 14–31 \xE–\x1F \16–\37 control codes ≠0 0 0 0 0 0 0 0 0 0 0 0 32 \x20 \40 space 0 ≠0 ≠0 ≠0 0 0 0 0 0 0 0 0 33–47 \x21–\x2F \41–\57 !"#$%&'()*+,-./ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0 48–57 \x30–\x39 \60–\71 0123456789 0 ≠0 0 0 ≠0 0 ≠0 0 0 0 ≠0 ≠0 58–64 \x3A–\x40 \72–\100 :;<=>?@ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0 65–70 \x41–\x46 \101–\106 ABCDEF 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 ≠0 71–90 \x47–\x5A \107–\132 GHIJKLMNOP
QRSTUVWXYZ 0 ≠0 0 0 ≠0 0 ≠0 ≠0 ≠0 0 0 0 91–96 \x5B–\x60 \133–\140 [\]^_` 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0 97–102 \x61–\x66 \141–\146 abcdef 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 ≠0 103–122 \x67–\x7A \147–\172 ghijklmnop
qrstuvwxyz 0 ≠0 0 0 ≠0 0 ≠0 ≠0 0 ≠0 0 0 123–126 \x7B–\x7E \172–\176 {|}~ 0 ≠0 0 0 ≠0 ≠0 0 0 0 0 0 0 127 \x7F \177 backspace character (DEL) ≠0 0 0 0 0 0 0 0 0 0 0 0 Conversions to numeric formats converts a byte string to a floating point value
(function) [edit] converts a byte string to an integer value
(function) [edit] converts a byte string to an integer value
(function) [edit] converts a byte string to an unsigned integer value
(function) [edit] converts a byte string to a floating-point value
(function) [edit] converts a byte string to std::intmax_t or std::uintmax_t
(function) [edit] String manipulation copies one string to another
(function) [edit] copies a certain amount of characters from one string to another
(function) [edit] concatenates two strings
(function) [edit] concatenates a certain amount of characters of two strings
(function) [edit] transform a string so that strcmp would produce the same result as strcoll
(function) [edit] String examination returns the length of a given string
(function) [edit] compares two strings
(function) [edit] compares a certain number of characters from two strings
(function) [edit] compares two strings in accordance to the current locale
(function) [edit] finds the first occurrence of a character
(function) [edit] finds the last occurrence of a character
(function) [edit] returns the length of the maximum initial segment that consists
of only the characters found in another byte string
(function) [edit] returns the length of the maximum initial segment that consists
of only the characters not found in another byte string
(function) [edit] finds the first location of any character from a set of separators
(function) [edit] finds the first occurrence of a substring of characters
(function) [edit] finds the next token in a byte string
(function) [edit] Character array functions searches an array for the first occurrence of a character
(function) [edit] compares two buffers
(function) [edit] fills a buffer with a character
(function) [edit] copies one buffer to another
(function) [edit] moves one buffer to another
(function) [edit] Miscellaneous returns a text version of a given error code
(function) [edit] [edit] See also

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