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

[Robert A. <ral...@gm...>]

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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