Sams Teach Yourself C in 21 Days

Printing Your Listings 27

36: fprintf( stdprn, “%4d:\t%s”, line++, buffer );

37: }

38:

39: fprintf( stdprn, “\f” );

40: fclose(fp);

41: return 0;

42: }

43:

44: void do_heading( char *filename )

45: {

46: page++;

47:

48: if ( page > 1)

49: fprintf( stdprn, “\f” );

50:

51: fprintf( stdprn, “Page: %d, %s\n\n”, page, filename );

52: }

LISTINGT&R 1 continued

This listing uses a value that is available within many PC compilers, but not

necessarily in all other compilers. Although stdoutis an ANSI-defined value,

stdprnis not. You need to check your compiler for specifics on sending out-

put to the printer.

One option for getting around this is to change the stdprnstatements to

stdoutstatements. This causes the output to go to the screen. Using your

operating system’s redirection features (or by piping if you’re using UNIX or

Linux), you should be able to redirect the output from the screen to the

printer.

Note

On Day 14, “Working with the Screen, Printer, and Keyboard,” you will learn more

about how this program works.

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