isgraph : 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 isgraph:\n"
      << ( isgraph( 'Q' ) ? "Q is a" : "Q is not a" )
      << " printing character other than a space\nSpace " 
      << ( isgraph(' ') ? "is a" : "is not a" )
      << " printing character other than a space" << endl;
   return 0;
}

According to isgraph:
Q is a printing character other than a space
Space is not a printing character other than a space