loops.md

1. Write a function countdown that takes a number n as input and prints the countdown from n to 0.

2. The computer is way too fast. To a human observer, it would seem that all numbers in the countdown are printed at once. Figure out, using your favourite search engine, what can be done to add a delay in between numbers.

3. Modify the yes function so that it takes a number n and prints y exactly n times.

   Remark: In the old days when everyone used to live inside the terminal, this yes function was used to automatically answer "yes" to all questions produced by prompt. See the yes program wikipedia entry.

4. Suppose python didn't provide a multiplication operator. Show how to define a mul function that takes two numbers and returns its product. The mul function should not use any multiplicative operators.