ispunct : char functions « Data Types « C++ Tutorial

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2. Data Types
3. char functions

#include <iostream>
using std::cout;
using std::endl;

#include <cctype>
using std::iscntrl;
using std::isgraph;
using std::isprint;
using std::ispunct;
using std::isspace;

int main()
{
   cout << "\nAccording to ispunct:\n"
      << ( ispunct( ';' ) ? "; is a" : "; is not a" )
      << " punctuation character\n"
      << ( ispunct( 'Y' ) ? "Y is a" : "Y is not a" )
      << " punctuation character\n"
      << ( ispunct('#') ? "# is a" : "# is not a" )
      << " punctuation character\n";
   return 0;
}

According to ispunct:
; is a punctuation character
Y is not a punctuation character
# is a punctuation character