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really really simple C++ question

Started by mattd Jul 10, 2000 at 8:19 PM 9 replies 550+ views

Original Post

Jul 10, 2000 at 8:19 PM

(ohmygod - it's related to programming!) uh............. how do we use 'new' to make a multidimensional array? i thought it was something like this..

        

class stuff
{
  public:
    stuff(int x, int y)
    {
      grid = new short int[3][x][y];
    }
  protected:
    short int* grid;
};

int main(void)
{
  stuff foo(3, 5);
  return 0;
}

hope i got those source tags right...

plz help mattd

The world is your message board - (edited to be politically correct) Edited by - mattd on 7/10/00 8:22:01 PM

mattd

Jul 10, 2000 at 9:39 PM

someone better reply soon or i''m going to .........

.......
.............
.........................
........do something bad

The world is your message board - (edited to be politically correct)

Pouya

Jul 11, 2000 at 12:54 AM

        
class stuff
{
public:
    stuff(int x, int y)
    {
         grid = new (short int **)[3];
         for (int i=0; i<3; i++)
         {
             grid[ i ] = new (short int *)[x];
             for (int j=0; j<x; j++)
                 grid<i>[j] = new (short int)[y];
         }
    }
protected:
    short int ***grid;

// umm, dont forget to free everything!

};

int main(void)
{
    stuff foo(3, 5);
    return 0;
}

----------------
- Pouya / FOO!!!
***CENSORED***

Edited by - pouya on July 11, 2000 1:55:23 AM

The Alchemist

Jul 11, 2000 at 1:02 AM

well who teach this to me was my old C teacher and he was a idiot so it maybe be wrong, you can´t declare arrays with variables on it, i don´t know why i´m only a newbie too.

============
-and i will make a termal usine with concrete, plutonioum and paper bags.
-nanny we have paper bags???
gonzo. Muppet babies

The Alchemist

Jul 11, 2000 at 1:04 AM

you have quick fingers pouya.

============
-and i will make a termal usine with concrete, plutonioum and paper bags.
-nanny we have paper bags???
gonzo. Muppet babies

Pouya

Jul 11, 2000 at 1:06 AM

quote:
Original post by The Alchemist

you have quick fingers pouya.

that happened after 6 years of only seeing a monitor right in front of me

(notice that i''ve gone a bit insane?)

----------------
- Pouya / FOO!!!
***CENSORED***

mattd

Jul 11, 2000 at 2:47 AM

thnks pouya

The world is your message board - (edited to be politically correct)

Pouya

Jul 11, 2000 at 11:50 AM

quote:
Original post by mattd
The world is your message board - (edited to be politically correct)

see, now all the ppl are gonna think that some plotical things are going on in here (my sig first, then yours, who''s next?)

----------------
- Pouya / FOO!!!
***CENSORED***

mattd

Jul 12, 2000 at 12:02 AM

ok - here''s another one - when deleting this mutlidimensional array, do i have to do

    
~stuff(void)  {
  for(int temp=0;temp<3;temp++)
    for(int temp2=0;temp2<mapX;temp2++)
      for(int temp3=0;temp3<mapY;temp3++)
        delete[temp][temp2][temp3] grid;  // is this right?

}
[/source]

or just

[source]
~stuff(void) {
  delete[] grid;
}

?

help pouya - you''re pretty fast

The world is your message board - (edited to be politically correct)

mattd

Jul 12, 2000 at 12:04 AM

oops... silly [source] bug.....

anyways i''m sure you''re all smart enought to figure it out

The world is your message board - (edited to be politically correct)

Pouya

Jul 12, 2000 at 12:12 AM

    
stuff::~stuff(void)
{
    for(int temp=0;temp<3;temp++)
    {
        for(int temp2=0;temp2<mapX;temp2++)
            delete[] grid[temp][temp2];
        delete[] grid[temp];
    }
    delete[] grid;
}

----------------
- Pouya / FOO!!!
***CENSORED***

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