cpp/string/byte/isblank

Checks if the given character is a blank character as classified by the currently installed C locale. Blank characters are whitespace characters used to separate words within a sentence. In the default C locale, only space and horizontal tab  are classified as blank characters.

The behavior is undefined if the value of is not representable as  and is not equal to eof.

Return value
Non-zero value if the character is a blank character, zero otherwise.