comp.lang.c

Joseph Sanoyo

8/13/2011 6:40:00 AM

On Aug 13, 2:04 am, Seebs <usenet-nos...@seebs.net> wrote:
> On 2011-08-13, Joseph Santoyo <josephsant...@gmail.com> wrote:
>
> > Is there any way to write this code without an else if?
>
> Sure!
>
> > If so how..and
> > can you explain it line by line please :/ I'm really new to C or
> > programming.
>
> Welcome!
>
> > /* count blanks, tabs and newlines in input */
> > main()
>
> You should probably spell this
>         int
>         main(void)
> in modern C.
>
> >            if (c == ' ')
> >                    ++bl;
> >            else if (c == '\t')
> >                    ++t;
> >            else if (c == '\n')
> >                    nl;
>
> (You missed the "++" on the last one; it should be "++nl".)
>
> You can write this without else if as follows:
>
> >            if (c == ' ')
> >                    ++bl;
> >            if (c == '\t')
> >                    ++t;
> >            if (c == '\n')
> >                    ++nl;
>
> It's not necessarily any better or more efficient, but it'll work.
>
> The way I'd probably do it would be:
>                 switch (c) {
>                 case ' ': ++bl; break;
>                 case '\t': ++t; break;
>                 case '\n': ++nl; break;
>                 default: break;
>                 }
>
> 'switch' jumps to a case matching the controlling expression, then executes
> code until it hits a 'break'.  It's often relatively efficient for cases
> where there are many options; compilers may generate smarter code than for
> the corresponding sequence of else if ()s.
>
> >    printf("There are %d blanks, %d tabs and %d newlines", bl, t, nl);
>
> ... and
>         return 0;
> here.
>
> > }
>
> -s
> --
> Copyright 2011, all wrongs reversed.  Peter Seebach / usenet-nos...@seebs.nethttp://www.seebs.net/... lawsuits, religion, and funny pictureshttp://en.wikipedia.org/wiki/...(Scientology) <-- get educated!
> I am not speaking for my employer, although they do rent some of my opinions.

Hey this is the second time you help me! Thanks a lot man :D!!

Your explanations are very clear.