Re: [Dev-C++] Array increment in C

[sam <as...@ya...>]

Thank you

--- On Fri, 6/17/11, Robert Alatalo <ral...@gm...> wrote:

> From: Robert Alatalo <ral...@gm...>
> Subject: Re: [Dev-C++] Array increment in C
> To: "sam" <as...@ya...>
> Cc: dev...@li...
> Date: Friday, June 17, 2011, 4:26 AM
> Hello,
> 
> As you go though the loop the responses [ answer ] 
> will vary 1 , 2,
> 6, 4, 8 , etc...
> as it goes though the  responses array ( hopefully
> there are then then
> 40 items in the array
> as that is the size of the array.  Note the size of
> the frequency
> array is 11, it is just not fully initialized (though it
> should
> default to zeros as it's on the stack, and the {0} may be
> repeated to
> fill all 11 slots.
> 
> Since the frequency array has 11 slots, it should start out
> as
> 0,0,0,0,0,etc...
> 
> As you go though the loop, you increment each slot that is
> indexed by
> the value of responses [ answer ] , ie.. 1, 2, 6, 4, ...
> as the largest value I see if 10, that should not overflow
> the 0 to 10
> index of the 11 element array.
> 
> At the end you just look though the frequency array,
> skipping the
> first element (index zero).
> 
> Hope that helps,
> Robert
> 
> On Fri, Jun 17, 2011 at 5:56 AM, sam <as...@ya...>
> wrote:
> > Sorry it has been a while since I program.
> > It is a stupid question. So, please forgive my
> ignorance. Maybe I lose my memory or something!!
> > I have a problem with the below code!!!
> > I can’t understand this part:     ++frequency [
> responses [ answer ] ];
> > I know this part increment 1 to the value position of
> the result of this one responses [ answer ]
> > For example responses [ answer ]= 1; then
>    ++frequency [1]
> > But how did the result of frequency[ rating ]=
> 2,2,2,2,5,11,5,7,1,3 ?????
> > So can you please explain it to me?
> >
> //////////////////////////////////////////////////////
> > #include <stdio.h>
> > #define RESPONSE_SIZE 40
> > #define FREQUENCY_SIZE 11
> > int main()
> > {
> >    int answer, rating, frequency[ FREQUENCY_SIZE ] =
> { 0 };
> >    int responses[ RESPONSE_SIZE ] =
> >       { 1, 2, 6, 4, 8, 5, 9, 7, 8, 10,
> >         1, 6, 3, 8, 6, 10, 3, 8, 2, 7,
> >         6, 5, 7, 6, 8, 6, 7, 5, 6, 6,
> >         5, 6, 7, 5, 6, 4, 8, 6, 8, 10 };
> >    for ( answer = 0; answer <= RESPONSE_SIZE - 1;
> answer++ )
> >      ++frequency [ responses [ answer ] ];
> >    printf( "%s%17s\n", "Rating", "Frequency" );
> >    for ( rating = 1; rating <= FREQUENCY_SIZE -
> 1; rating++ )
> >       printf( "%6d%17d\n", rating, frequency[
> rating ] );
> >    getchar();
> >    return 0;}
> > //////////////////////
> >
> >
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