Static Matrix Casting to a pointer

Question

I have matrix M:

float M[4][3] = {
    0, 0, 0,
    0, 1, 1,
    1, 0, 1,
    1, 1, 0};

And I need to cast M with the purpose of use the method

Answer 1

If you want (or need) to do the arith yourself, avoid the cast:

void foo(float **pmatrix)
{
    float *matrix = *pmatrix;

    for (int r = 0; r < 4; ++r)
    {
        for (int c = 0; c < 3; ++c)
            printf("%f ", matrix[(r * 3) + c]);
        printf("\n");
    }
}

float M[4][3] = {
    0, 0, 0,
    0, 1, 1,
    1, 0, 1,
    1, 1, 0
};

int main()
{
    float *p = &M[0][0];
    foo(&p);
}

But this code is ugly and error prone, if possible follow Luchian advice and correct the declaration.