How do I declare a 2d array in C using new

Questions

How do i declare a 2d array using new?

Like, for a "normal" array I would:

int* ary = new int[Size]

but

int** ary = new int[sizeY][sizeX]

a) doesn t work/compile and b) doesn t accomplish what:

int ary[sizeY][sizeX] 

does.

Answers

A dynamic 2D array is basically an array of pointers to arrays . You should initialize it using a loop, like this:

int** ary = new int*[rowCount];
for(int i = 0; i < rowCount; ++i)
    ary[i] = new int[colCount];

The above, for colCount= 5 and rowCount = 4, would produce the following:

<img src="https://i.stack.imgur.com/M75kn.png" alt="enter image description here">

Source

License : cc by-sa 3.0

http://stackoverflow.com/questions/936687/how-do-i-declare-a-2d-array-in-c-using-new

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