Sams Teach Yourself C in 21 Days

5. You might think that the defaultneeds to go at the bottom of the switchstate-
   ment, but this isn’t true. The defaultcan go anywhere. There is a problem, how-
   ever. There should be a breakstatement at the end of the defaultcase.


6. The code is as follows:
   if( choice == 1 )
   printf(“You answered 1”);
   else if( choice == 2 )
   printf( “You answered 2”);
   else
   printf( “You did not choose 1 or 2”);


7. The code is as follows:
   do {
   / any C statements /
   } while ( 1 );

Answers for Day 14

Quiz

1. A stream is a sequence of bytes. A C program uses streams for all input and out-
   put.


2. a. A printer is an output device.
   b. A keyboard is an input device.
   c. A modem is both an input and an output device.
   d. A monitor is an output device. (Although a touch screen would be an input
   device and an output device.)
   e. A disk drive can be both an input and an output device.


3. All C compilers support three predefined streams:stdin(the keyboard),stdout
   (the screen), and stderr(the screen). Some compilers, also support stdprn(the
   printer), and stdaux(the serial port COM1). Note that the Macintosh doesn’t sup-
   port the stdprnfunction.


4. a.stdout
   b.stdout
   c.stdin
   d.stdin
   e.fprintf()can use any output stream. Of the five standard streams, it can use
   stdout,stderr,stdprn, andstdaux.

864 Appendix F

49 448201x-APP F 8/13/02 11:22 AM Page 864