isalnum

Locale Convenience Function

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• Data Type and Member Function Indexes
• Synopsis
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Determines if a character is alphabetic or numeric.

None

#include <locale>
template <class charT> 

bool isalnum (charT c, const locale& loc) const;

The isalnum function returns true if the character passed as a parameter is either part of the alphabet specified by the locale parameter or a decimal digit, otherwise the function returns false. The check is made using the ctype facet from the locale parameter.

//
// isalnum.cpp
//

#include <iostream>

int main ()
{
  using namespace std;

  locale loc;
  
  cout << isalnum('a',loc) << endl;
  cout << isalnum(',',loc) << endl;
  
  return 0;
}

other is_ functions, locale, ctype

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