0x2000 EN QUAD. This function is used to check if the argument contains any whitespace characters. 0x2002 EN SPACE. Other locales may consider a different selection of characters as white-spaces, but never a character that returns true for isalnum. 0x180E MONGOLIAN VOWEL SEPARATOR. Although the Ideographic Space character (0x3000) is also generated by using the Spacebar (when IME is enabled), it is not handled specially. 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. 0x00A0 NO-BREAK SPACE. They look like a space, but are in fact a different (unicode) character. In C++, a locale-specific template version of this function exists in header . 0x1680 OGHAM SPACE MARK. Empty characters, blank characters, invisible characters and whitespace characters. Whitespace characters denote the empty space between all the characters you can actually see.They have width (height if you’re writing vertically), some special rules, and not much else. They can be used if you want to represent an empty space without using space. 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. What is white space? Standard white-space characters are − ' ' (0x20) space (SPC) '\t' (0x09) horizontal tab (TAB) '\n' (0x0a) newline (LF) '\v' (0x0b) vertical tab (VT) '\f' (0x0c) feed (FF) '\r' (0x0d) carriage return (CR) 0x0020 SPACE. Tokens are delimited (bounded) by white-space characters and by other tokens, such as operators and punctuation. The C library function int isspace (char c) checks whether the passed character is white-space. When rendered, a whitespace character does not correspond to a visible mark, but typically does occupy an area on a page. 0x2005 FOUR-PER-EM SPACE. Let's say you want to use an empty value in a website or application, but spaces are not accepted. 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 '. 0x2001 EM QUAD. 0x2006 SIX-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. In computer programming, whitespace is any character or series of characters that represent horizontal or vertical space in typography. 0x2004 THREE-PER-EM SPACE. The most common whitespace character, is the word space The one you get when you press the space bar. 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