COMS W3101-2
Homework 3: Functions, Templates, Classes, and Error Handling
Worth: 20% of total homework grade.

Goals:

The goal of this homework is to give you practice creating functions, creating classes, and handling errors with the C++ exception mechanisms.

Assignment:

1. hw3a.cc (30%)
   Make three functions taking an double as input:
   1. A function to calculate the area of a square given the length of one side.
   2. A function to calculate the area of a circle given the diameter
   3. A function (that uses the first two functions) to calculate the black area in the figure below, given the length of one side:
   
   
   Finally, write a main function that asks the user for the length of the square's side and prints out the black area.

2. hw3b.cc (20%)
   Rewrite hw3a.cc so function 3 tests for:
   1. negative input
   2. non-numeric input
   and throws exceptions for these two cases. Have your main function call function 3 in try/catch block requesting a positive number to be entered instead.
   

3. hw3c.cc (50%)
   Write a class for use as an email header.
   Your class should contain the following information:
   • To: the field holding the addresses to which the email was sent
   • From: the field holding the address from which the email was sent
   • Subject: the email subject
   • Date: the month, day, and year (all integer values - this should be encapsulated in a struct named Date - if you do not use a struct points will be deducted)
   Override the input and output operators to take in your class and print it out.
   input format:
   Bob@us.gov
   reich@cs.columbia.edu
   how are you doing?
   4 5 2006
   
   ouput format:
   TO: Bob@us.gov
   FROM: reich@cs.columbia.edu
   SUBJECT: how are you doing?
   DATE: 4/5/2006
   
   Finally, write a main function that asks the user:
   input a new header
   A single header is inputed by the user, after which the program should print out a message "### HEADERS BELOW ####", followed by the header. (use the input/output format specified above).

Files to be submitted:

• hw3a.cc
• hw3b.cc
• hw3c.cc
• typescript
• REAMDE

How To: