Multidimensional Array and Storing Data

[tianajrp]

Someone told me that multidimensional in C++ is something that shouldnt be touched, is it true?

Plus I have a question. Im making an RPG, 2d RPG which tile engine. I had been thinking and still have no idea how to implement a map

What I have in mind is that a class map:

class Map
{
private:
int maxX, maxY;

//code that goes here use to store data
public Map(int x, int y)
}

the code that use to store data will generate maxX, maxY tile and set it to default tile which is 0. I believe this will require some sort of array, but I really have no idea how to do this

[kbw]

Someone told me that multidimensional in C++ is something that shouldnt be touched, is it true?

I don't see why that would be true.

I had been thinking and still have no idea how to implement a map ... I believe this will require some sort of array.

A dictionary/map is a standard container in the C++ standard library.
http://www.cplusplus.com/reference/map/map/

[freddie1]

I allocate memory using an allocator, which gives me a linear address space. Then I write a macro which indexes into that allowing (x, y, z) type subscript notation. So far, in my C++ code, I've never needed to go beyond three dimensional arrays, and so I have code I could help you with to index into two and three dimensional arrays.

In my work I occasionally need four dimensional arrays, but I haven't yet taken the time to work that macro out in C/C++ syntax. I also code in PowerBASIC, and I believe that language allows up to 8 dimensions, dynamically allocated. In the app that needs four dimensional arrays, I used PowerBASIC.

If you want help or examples wit two or three dimensional arrays, let me know.

As far as I know, the issue with C and C++ is that all of the dimensions can't be allocated at run time. If I'm wrong about that, I hope somebody will tell me too. I know I did spend some time researching this quite a few years ago, and gave up on it with C++. It's my understnding C++ coders use various capabilities from STL and such to deal with this issue, as kbw intimated.

[tianajrp]

probably due to my misunderstanding (sorry my english is really bad) but let me make sure we are on the same page. The map im talking about is literally, a map. If you had ever played any 2d rpg, you will see your character walk on a bunch of tiles putted together. Those "bunch" of tiles putted together. That is called a map. Plainly speaking, a map is simply a data (sort of like array) that store x and y (coordinate) number that represent a tile.


For example:

class Map

{

private:

int MaxX, MaxY;  // this represent the maximum x and maximum y of a map;

(whatever im trying to do right here)

//the code goes here have to do with data storing, which i absolutely have no idea how to do this

public:

Map(int maxx, int maxy);

void draw();

//other function etc

} 

i want to use multidimensional array as something like this:

int myTiles[MaxX][MaxY]

then have a function that be like this:

for (int y = 0; y < MaxY; y++)

{

for (int x = 0; x < MaxX; x++)

{

myTiles[x][y] = 0;

}

}

If you can please teach me to use multidimensional array. I only need to use 2 variables x and y.

[freddie1]

I didn't think this would work, but it does. Maybe it shows what you are asking ...

#include <cstdio>

int main()
{
 int iCols=3,iRows=4;
 int arNums[iRows][iCols];
 arNums[0][0]=2 ,  arNums[0][1]=4,  arNums[0][2]=6;
 arNums[1][0]=8 ,  arNums[1][1]=10, arNums[1][2]=12;
 arNums[2][0]=14 , arNums[2][1]=16, arNums[2][2]=18;
 arNums[3][0]=20 , arNums[3][1]=22, arNums[3][2]=24;
 for(int i=0; i<4; i++)
     printf("%d\t%d\t%d\n", arNums[i][0], arNums[i][1], arNums[i][2]);
 getchar();

 return 0;
}

/*
Output
===================
2       4       6
8       10      12
14      16      18
20      22      24
*/