## WeBWorK Problems

### Re: The Correct answer displayed changes after user input

by Danny Glin -
Number of replies: 0
One more little thing about the code you posted:

The line
$a = Formula("$n1 / $d1"); casts$a as a formula, which is treated as a function of whatever variables are allowed in the current context, which by default is just x. That means that WeBWorK won't complain if students enter a function of x as their answer.

You should probably have the following instead:
$a = Compute("$n1 / \$d1" );

This should recognize the correct answer as being a real number, which means that students will get a warning message if they enter a function of x, telling them that it is expecting a number.

Using "Compute" rather than "Real" has the advantage of preserving the formatting of the answer as you entered it, i.e. leaving it as a fraction rather than storing the decimal version.