fig22_20.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. 22.20: fig22_20.cpp
// Using functions isspace, iscntrl, ispunct, isprint, isgraph.
#include <iostream>
using std::cout;
using std::endl;

#include <cctype> // character-handling function prototypes
using std::iscntrl;
using std::isgraph;
using std::isprint;
using std::ispunct;
using std::isspace;

int main()
{
   cout << "According to isspace:\nNewline " 
      << ( isspace( '\n' ) ? "is a" : "is not a" )
      << " whitespace character\nHorizontal tab " 
      << ( isspace( '\t' ) ? "is a" : "is not a" )
      << " whitespace character\n"
      << ( isspace( '%' ) ? "% is a" : "% is not a" )
      << " whitespace character\n";

   cout << "\nAccording to iscntrl:\nNewline " 
      << ( iscntrl( '\n' ) ? "is a" : "is not a" )
      << " control character\n"
      << ( iscntrl( '$' ) ? "$ is a" : "$ is not a" )
      << " control character\n";

   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";

   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";

   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;
} // end main

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