Edward Bartolo <edb...@gmail.com> writes:
[...]
> 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 seems to work, but I think it is
> too complicated. Any suggestions?
>
> --------------------------
> #include <stdio.h>
>
> int main()
> {
> int c, d = 0;
> while ((c = getchar()) != EOF) {
> if (c != ' ') {
> d = 0;
> putchar(c);
> }
> if (c == ' ' && d == 0) {
> putchar(c);
> d = 1;
> }
> }
>
> return 0;
> }
> ----------------------------
Conventional approach using a state variable:
--------
#include <stdio.h>
int main(void)
{
int c, blanks;
blanks = 0;
while ((c = getchar()) != EOF) {
if (blanks) {
if (c == ' ') continue;
blanks = 0;
} else
blanks = c == ' ';
putchar(c);
}
return 0;
}
--------
Less conventional approach using a function pointer as state variable.
NB: This is really overkill here but very helpful in case of (much) more
complicated state machines.
--------
#include <stdio.h>
static void put_a_char(int);
static void (*process_char)(int) = put_a_char;
static void skip_blanks(int c)
{
if (c == ' ') return;
process_char = put_a_char;
putchar(c);
}
static void put_a_char(int c)
{
putchar(c);
if (c == ' ') process_char = skip_blanks;
}
int main(void)
{
int c;
while ((c = getchar()) != EOF) process_char(c);
return 0;
}
--------
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