It's undefined..to see why......note that
12/3 = 4......because 4 * 3 = 12
But....what about 0 / 0 ??
It could be 2, because 2 * 0 = 0
Or...it could be pi, because pi * 0 = 0
Or.....it could be 11, because 11 * 0 = 0
In essence......we can't tell what it might be......!!