Topic: Error Checking and Exceptions
Related Reading: Chapter 13
Due: 10:00am, Tuesday 16 October 2018

Please make sure you adhere to the policies on academic integrity.

1. (10 points)

   Write a program that asks a user for a weight in pounds (possibly fractional), and outputs the weight in kilograms. (For the record, 1 pound equals approximately 0.45359 kilograms.)

   Your program should ensure that the user correctly entered a nonnegative numeric value as input. As sample session might appear as follows

   Enter a weight in pounds: no
   That is not a valid number.	
   Enter a weight in pounds: -5.3
   Weights must be nonnegative.
   Enter a weight in pounds: 2.5
   That is equal to 1.13398 kilograms.	
   

2. (10 points)

   Assume that we are writing a function doSomething(word, k) which expects that parameter word is a nonempty string, and that parameter k is a nonnegative intger that has value no greater than the length of the given word.

   Give an implementation of such a function that rigorously checks that the parameters adhere to these expectations. (Once you've performed the parameter-checking, you don't need to do anything within the function body.)