isdigit()

Library:  Localization

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Locale convenience function that determines if a character is a decimal digit

#include <locale>

namespace std {
  template <class charT> 
  bool isdigit(charT c, const locale& loc);
}

The isdigit() function returns true if the character passed as a parameter is a decimal digit. Otherwise, the function returns false. The check is made using the ctype facet from the locale parameter.

ctype, locale, isalnum(), isalpha(), iscntrl(), isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(), isxdigit()

ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 22.1.3.1