Lecture Notes on 5 Feb 2014

Let us recapitulate what we did in previous lectures.

* We see the world in binary

* Number conversions - binary, octal, and hexadecimal

* Structure of Python

* Arithmetic Operators

* Algorithms

New Topics in this lecture

* Problem Decomposition
  - Analysis
      Ask what is given and what you should output
  - Design
      Create the algorithm to solve the problem
  - Implementation
      Code the algorithm in Python
  - Testing
      Constantly test as you write. Use print statements liberally.

* Develop Iteratively
  - Add a few lines of code and test
  - Always test as you write code

* Outline of Easter Sunday
def main():
  # prompt the user to enter the year
  y = int (input ('Enter year: '))
  print (y)

  # determine a
  a = y % 19
  print (a)

  ...

  # Write out the result
  if (n == 3):
    print ('In', y, 'Easter Sunday is on', p, 'March')

main()

* Expressions and Statements 

* Comparison operators: < <= > >= == !=

* Understand the difference between the following two pieces of code
  x = 1		# statement
  x == 1	# expression