How can I make the random number generation uniform in c

My idea is to create a two-dimensional array using c, that prints values ​​randomly, the range I defined was between 0 and 1, one example:

srand(time(NULL));
arr[6][6] = rand()%2;

When I loop through the array it generates an output like this:

110111
111101
111111
101111
101011
100001

so far so good, the problem comes when I try to uniformly distribute the probability with which the numbers are generated, that is, that the probability of generating 1 is the same as that of 0, for example an array where half of its values ​​are a number and the other half another number, in this case 1 and 0.

I appreciate any help