Fastest way to zero out a 2d array in C?

Question

I want to repeatedly zero a large 2d array in C. This is what I do at the moment:

// Array of size n * m, where n may not equal m
for(j = 0; j < n; j++)
{
            


        

Answer 1

If you initialize the array with malloc, use calloc instead; it will zero your array for free. (Same perf obviously as memset, just less code for you.)