Re: multidimensional array class

From:

"Daniel T." <daniel_t@earthlink.net>

Newsgroups:

comp.lang.c++

Date:

Tue, 20 Apr 2010 16:16:10 -0400

Message-ID:

<daniel_t-5C6B60.16161020042010@70-3-168-216.pools.spcsdns.net>

Mike <michael.sgier@gmail.com> wrote:

I tried so:

droplet::droplet(int x, int y, int spd) {
int i=0;
   pos = new int[x*y];
   while(i<16){
    trail[i] = 32+rand()%223;
    i++;
   }
    speed=spd;
}

but when I try to access y or x later in a function i get "not
declared"
           if(drops[y]+speed>top

You need to declare "drops" to remove the immediate error, but there are
a whole bunch of other issues that you have to deal with. In order to
help you, I would need to know what it is you are trying to accomplish
because I can't figure it out from the code you have presented so far.

Your primary problem seems to be understanding what 'pos' is and how to
use it. So here is a short primmer:

#include <iostream>
#include <iomanip>

int main() {
   int pos[4][4];

   // initialize all the elements in 'pos'
   for (int y = 0; y < 4; ++y)
      for (int x = 0; x < 4; ++x)
         pos[x][y] = x * 10 + y;


   // print all the elements in 'pos'
   for (int y = 0; y < 4; ++y) {
      for (int x = 0; x < 4; ++x)
         std::cout << std::setfill('0') << std::setw(2)
                   << pos[x][y] << ' ';
      std::cout << '\n';
   }
}