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

1. C++ Tutorial
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 isprint:\n"
      << ( isprint( '$' ) ? "$ is a" : "$ is not a" )
      << " printing character\nAlert " 
      << ( isprint( '\a' ) ? "is a" : "is not a" )
      << " printing character\nSpace "
      << ( isprint( ' ' ) ? "is a" : "is not a" )
      << " printing character\n";
   return 0;
}

According to isprint:
$ is a printing character
Alert is not a printing character
Space is a printing character