If $p$ and $q$ are positive integers, then $\frac{p}{q}$ is a $\ldots \ldots$. rational number and $\frac{p}{-q}$ is a ________________ rational number.
If the integers $p$ and $q$ have no common divisor other than 1 and $q$ is positive, then the rational number $\frac{p}{q}$ is said to be in the ________________ .