Although the Ideographic Space character (0x3000) is also generated by using the Spacebar (when IME is enabled), it is not handled specially. Other locales may consider a different selection of characters as white-spaces, but never a character that returns true for isalnum. The most common whitespace character, is the word space The one you get when you press the space bar. They look like a space, but are in fact a different (unicode) character. 0x2003 EM SPACE . 0x2002 EN SPACE. What is white space? 0x2005 FOUR-PER-EM SPACE. The trailing whitespace characters are not removed.File and Folder names that begin or end with a whitespace character are enumerated differently by the Win32 and WinRT APIs due to ecosystem requirements. They can be used if you want to represent an empty space without using space. In C++, a locale-specific template version of this function exists in header . Tokens are delimited (bounded) by white-space characters and by other tokens, such as operators and punctuation. There are many types of whitespace characters in c++ such as- 0x1680 OGHAM SPACE MARK. 0x00A0 NO-BREAK SPACE. 0x0020 SPACE. In computer programming, whitespace is any character or series of characters that represent horizontal or vertical space in typography. 0x2006 SIX-PER-EM SPACE… If a file is saved as 'Foo.txt ', where the trailing character(s) is an alternate whitespace character, such as the Ideographic Space (0x3000), it will be saved to the file system as 'Foo.txt '. In C++, isspace is a predefined function used for string and character handling.cstring is the header file required for string functions and cctype is the headerfile required for character functions. Empty characters, blank characters, invisible characters and whitespace characters. Space, tab, line feed (newline), carriage return, form feed, and vertical tab characters are called "white-space characters" because they serve the same purpose as the spaces between words and lines on a printed page — they make reading easier. 0x2004 THREE-PER-EM SPACE. This function is used to check if the argument contains any whitespace characters. The C library function int isspace (char c) checks whether the passed character is white-space. 0x180E MONGOLIAN VOWEL SEPARATOR. 0x2000 EN QUAD. Let's say you want to use an empty value in a website or application, but spaces are not accepted. For a detailed chart on what the different ctype functions return for each character of the standard ASCII character set, see the reference for the header. 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