fig08_02.c

C程序设计经典教程第5版程序示例,比较适合初级c语言的学生

/* Fig. 8.2: fig08_02.c
   Using functions isdigit, isalpha, isalnum, and isxdigit */
#include <stdio.h>
#include <ctype.h>
 
int main( void )
{ 
   printf( "%s\n%s%s\n%s%s\n\n", "According to isdigit: ",
       isdigit( '8' ) ? "8 is a " : "8 is not a ", "digit",
       isdigit( '#' ) ? "# is a " : "# is not a ", "digit" );

   printf( "%s\n%s%s\n%s%s\n%s%s\n%s%s\n\n", 
       "According to isalpha:",
       isalpha( 'A' ) ? "A is a " : "A is not a ", "letter",
       isalpha( 'b' ) ? "b is a " : "b is not a ", "letter",
       isalpha( '&' ) ? "& is a " : "& is not a ", "letter",
       isalpha( '4' ) ? "4 is a " : "4 is not a ", "letter" );

   printf( "%s\n%s%s\n%s%s\n%s%s\n\n", 
       "According to isalnum:",
       isalnum( 'A' ) ? "A is a " : "A is not a ", 
       "digit or a letter",
       isalnum( '8' ) ? "8 is a " : "8 is not a ", 
       "digit or a letter",
       isalnum( '#' ) ? "# is a " : "# is not a ", 
       "digit or a letter" );

   printf( "%s\n%s%s\n%s%s\n%s%s\n%s%s\n%s%s\n", 
       "According to isxdigit:",
       isxdigit( 'F' ) ? "F is a " : "F is not a ", 
       "hexadecimal digit",
       isxdigit( 'J' ) ? "J is a " : "J is not a ", 
       "hexadecimal digit",
       isxdigit( '7' ) ? "7 is a " : "7 is not a ", 
       "hexadecimal digit",
       isxdigit( '$' ) ? "$ is a " : "$ is not a ", 
       "hexadecimal digit",
       isxdigit( 'f' ) ? "f is a " : "f is not a ", 
       "hexadecimal digit" );

   return 0; /* indicates successful termination */

} /* end main */



/**************************************************************************
 * (C) Copyright 1992-2007 by Deitel & Associates, Inc. and               *
 * Pearson Education, Inc. All Rights Reserved.                           *
 *                                                                        *
 * DISCLAIMER: The authors and publisher of this book have used their     *
 * best efforts in preparing the book. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these books. The authors *
 * and publisher shall not be liable in any event for incidental or       *
 * consequential damages in connection with, or arising out of, the       *
 * furnishing, performance, or use of these programs.                     *
 *************************************************************************/