Vocabulary - Floor

The floor function $\lfloor x \rfloor$ rounds $x$ down to the nearest integer. For example, $\lfloor 7.9 \rfloor = 7$ and $\lfloor -2.3 \rfloor = -3$ (down means toward negative infinity).

Integer division is floor division for positive numbers. When you compute $\lfloor 7 / 3 \rfloor$, you get $2$, the same as integer division.

Watch out for negative numbers. $\lfloor -7 / 3 \rfloor = \lfloor -2.333... \rfloor = -3$, not $-2$. Different languages handle this differently, so check the documentation.