sameParity

$\newcommand{\arraycolsep}[3]{} \newcommand{\dd}[2][]{\frac{d #1}{d #2}} \newcommand{\pp}[2][]{\frac{\partial #1}{\partial #2}} \newcommand{\veci}{\vec{\hat{\bf\imath}}} \newcommand{\vecj}{\vec{\hat{\bf\jmath}}} \newcommand{\utan}{\vec{\hat{t}}} \newcommand{\unormal}{\vec{\hat{n}}} \newenvironment{amatrix}[1]{% \begin{bmatrix} }{% \end{bmatrix} }$

$\newenvironment {prompt}{}{} \newcommand {\ungraded }[0]{} \newcommand {\exchange }[2]{#2#1} \newcommand {\HyperFirstAtBeginDocument }[0]{\AtBeginDocument }$

This demonstrates a slightly more complex validator that uses both user input and supplied answer.

This validator checks to see if the provided answer has the same even/odd parity as the author-provided answer. This first one expects an even number (content author provided answer is 22).

Enter an even number! $\answer [validator=sameParity]{22}$

Now try an odd number! Supplied answer is 27

Enter an even number! $\answer [validator=sameParity]{27}$