Hi,
I am saving your program for future study as its level is beyond the
current level I am at. I am still at page 34 ("The C programming
language" (Kernighan & Ritchie))
Thanks, Edward
On 21/06/2016, Peter Olson <pe...@peabo.com> wrote:
>> On June 20, 2016 at 10:37 AM Edward Bartolo <edb...@gmail.com> wrote:
>>
>> On page Page 34 Exercise 1-9
>> "Write a program to copy its input to its output, replacing each
>> string of blanks one ore more blanks by a single blank."
>>
>> I wrote the following, tested it, and it seems to work, but I think it is
>> too complicated. Any suggestions?
>
> Here's another way to do it:
>
> /*
> * K&R exercise
> *
> * Replace multiple blanks with single blank
> */
>
> #include <stdio.h>
> #include <string.h>
> #include <errno.h>
>
> static
> int
> filter (void)
> {
> int ch = getchar (); /* all the logic is here */
> if (EOF != ch)
> {
> putchar (ch);
> if (' ' == ch)
> for (;;)
> {
> ch = getchar ();
> if (' ' != ch)
> {
> if (EOF != ch)
> putchar (ch);
> break;
> }
> }
> }
> return ch;
> }
>
> static
> int
> checkError (FILE * fp, const char *arg)
> {
> if (ferror (fp))
> {
> const char *pgmName = strrchr (arg, '/');
> if (pgmName)
> pgmName++; /* get beyond the slash */
> else
> pgmName = arg;
> fprintf (stderr, "%s: I/O error: %s\n", pgmName, strerror (errno));
> return 1;
> }
> return 0;
> }
>
> int
> main (int argc, char **argv)
> {
> while (EOF != filter ())
> continue; /* this version encodes state in program structure
> */
> if (checkError (stdin, argv[0]))
> return 1; /* this version checks for errors */
> if (checkError (stdout, argv[0]))
> return 1; /* I didn't actually reproduce this error, it is
> hard to test */
> return 0;
> }
>
> I hope this survives line wrapping :-)
>
> Peter Olson
>
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