Your problem might be more logical than with just code. The pset seems to ask more how many quarters, dimes, nickels, and pennys at minimum can you get to the exact change needed. This requires you to at least do some subtraction with n. You want to constantly subtract n with the maximum amount of cash you can subtract (25, 10, 5, or 1) without going below 0.

In any other case though, you might also be doing a while loop wrong, it should look like this:

while (n < 0)
{
    <put code here that will run if n < 0>
}

Good luck on this pset though!

Your problem might be more logical than with just code. The pset seems to ask more how many quarters, dimes, nickels, and pennies at a minimum can you get to the exact change needed. This requires you to at least do some subtraction with n. You want to constantly subtract n with the maximum amount of cash you can subtract (25, 10, 5, or 1) without going below 0.

In any other case though, you might also be doing a while loop wrong, it should look like this:

while (n < 0)
{
    //put code here that will run if n < 0
}

Good luck on this pset though!