Initialize a 2D array with zero in the constructor C++

Question

What is the best way to initialize a large 2D array with 0 in the constructor? I would like to do this without having to loop through my array, if possible.

Answer 1

Alternatively, use a std::vector instead of an array.

std::vector<std::vector<int>> vec2d(100, std::vector<int>(50, 0));

The resulting two-dimensional vector will contain 100 vectors, each containing 50 zeros.

Answer 2

use memset. For example:

int a[10][10]; 
memset(a, 0, sizeof(int)*10*10);