Lecture Notes on 27 Jan 2017

Active Reading: Type code as you read.

Read Chapter 2: Sections 2.9 - 2.14 (leave out Graphics)

Write the code from the following listings and run them:

* Listing 2.6: SalesTax.py

* Listing 2.7: ShowCurrentTime.py

* Listing 2.8: ComputeLoan.py

* Listing 2.9: ComputeDistance.py

# this program determines if the three sides form a right angled triangle

def main():
  # prompt user to enter the sides of a triangle
  a = int (input ("Enter side 1: "))
  b = int (input ("Enter side 2: "))
  c = int (input ("Enter side 3: "))

  # square the sides
  a2 = a * a
  b2 = b * b
  c2 = c * c

  # apply the Pythagorean theorem
  cond = ((a2 + b2) == c2) or ((b2 + c2) == a2) or ((c2 + a2) == b2)

  # write out the result
  if (cond):
    print ("is right angled triangle")
  else:
    print ("is not right angled triangle")

main()

# this program prints three numbers in ascending order

def main():
  # prompt user to enter three numbers
  a = int (input ("Enter num 1: "))
  b = int (input ("Enter num 2: "))
  c = int (input ("Enter num 3: "))

  # assign a to have the smallest value
  if (a > b):
    a, b = b, a

  if (a > c):
    a, c = c, a

  # assign c to have the largest value
  if (b > c):
    b, c = c, b

  # print the result
  print (a, b, c)

main()

# this program determines if three sides form a triangle

def main():
  # prompt the user to enter three sides
  a = int (input ("Enter side 1: "))
  b = int (input ("Enter side 2: "))
  c = int (input ("Enter side 3: "))

  # set up the conditions
  cond1 = (a + b ) > c
  cond2 = (b + c) > a
  cond3 = (c + a) > b

  # print the result
  if (cond1 and cond2 and cond3):
    print ("is triangle")
  else:
    print ("is not triangle")

main()