8. You have three identical prizes to give away and a pool of ten finalists. The Finalists are assigned numbers from 1 to 10. Write a program to randomly select the numbers of three finalists to receive a prize. Make sure not to pick the same number twice. For example, picking finalists 3, 6, 2 would be valid but picking 3, 3, 11 would be invalid because finalist number 3 is listed twice and 11 is not a valid finalist number.
13. Imagine a program that displays a menu of five possible choices, lettered a through e. Suppose the user's selection is read into the character variable choice. Write a switch statement that reacts to this choice by displaying a message that indicates the choice. Display an error message if the user makes an invalid choice.