CODEWITHSUNDEEP
c++arraysmultidimensional-array
user2944170
user2944170

Reputation:

The simplest way of defining 2_dimensional array in c++

I need an 2_dimensional array in c++ which gets the dimension from user. How can I define an int 2_dimensional array in c++? I found something that define a 1_dimensional array then define other array in each element. like this:

int **ary = new int[sizeY];
for (int i = 0; i < sizeY; i++)
    ary[i] = new int[sizeX];

Is there any other simple way?

Upvotes: 1

Views: 88

Answers (3)

Attila
Attila

Reputation: 451

For me the simpliest method is to use vector. With it you can write code like this:

vector< vector<int> > arr(rows, vector<int>(cols, 0));

This will create a new 2d vector which you can use like array. As far as I am conserned this method is more preferable because you don't have to think about releasing memory.

Upvotes: 0

bolov
bolov

Reputation: 75697

std::vector<std::vector<int>> myarray(sizeY, std::vector<int>(sizeX));

Upvotes: 3

jordsti
jordsti

Reputation: 756

You should use a vector of a vector to do a 2 dimension array in c++

std::vector< std::vector<int> > myarray;

for(int i = 0; i < sizeY; i++)
{
     myarray.push_back(std::vector<int>());
     for(int j = 0; j < sizeX; j++)
     {
          myarray[i].push_back(0);
     }
}

And you can access your element with myarray[y][x]

Upvotes: 0

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