$-$Q R $1\mathrm{.}10$ Write three versions of the & Nloprinter, jwus program that have different compiletime errors. Write a version that has a run$-$time error.

R$1\mathrm{.}11$ How do you discover syntax erroes? How do you discover logic errors?

$*$or R$1\mathrm{.}12$ The cafeteria offers $2$ discount card for sale that enuitles you, during a certain period, to a free meal whenever you have bought $1$ given number of meals at the regular price. The exact details of the offer change from time to time. Deseribe an alporithm that lets you determine whether a particular offer is a good buy. Whar other inputs do you need?