Introduction to what algorithms are, and how to create them for real life

1. Algorithm

2. What is an algorithm?

3. “A set of rules to be
followed in problem
solving operations.”

4. or “A Recipe”

5. Input Algorithm Output

6. Input Algorithm Output
“A set of rules to be
followed in problem
solving operations.”

7. Input Algorithm Output
• 2 slices bread
“A set of rules to be
• 1 tbsp peanut butter followed in problem
• 2 tsp strawberry jam solving operations.”

8. Input Algorithm Output
• 2 slices bread
“A set of rules to be
• 1 tbsp peanut butter followed in problem
• 2 tsp strawberry jam solving operations.”

9. Input Algorithm Output
• 2 slices bread
• 1 tbsp peanut butter
• 2 tsp strawberry jam

10. Selena & Michelle’s
PBJ algorithm
How many steps do you think it will
take?

11. There’s more than
one way to do it.

12. """
(C) Gerold Penz)
Python can be simple, too :-)
"""
for quant in range(99, 0, -1):
if quant > 1:
print quant, "bottles of beer on the wall,", quant, "bottles of beer."
if quant > 2:
suffix = str(quant - 1) + " bottles of beer on the wall."
else:
suffix = "1 bottle of beer on the wall."
elif quant == 1:
print "1 bottle of beer on the wall, 1 bottle of beer."
suffix = "no more beer on the wall!"
print "Take one down, pass it around,", suffix
print "--"

13. # (c) Barbara Shaurette
def bottles():
for i in reversed(range(100)):
if i > 0:
b = "bottles"
if i == 1: b = "bottle"
print i, b, "of beer on the wall,",
i, b, "of beer"
print "Take one down, pass it around,",
i-1, "bottles of beer on the wallnr"
bottles()

14. Your algorithms

15. Example: Get from
the airport to home.

16. “The taxi algorithm”
• Go to the taxi stand.
• Get in a taxi.
• Give the driver my address.

17. “The call-me
algorithm”
• When your plane arrives, call my cell
phone.
• Meet me outside baggage claim.

18. “The rent-a-car
algorithm”
• Take the shuttle to the rental car place.
• Rent a car.
• Follow the directions to get to my
house.

19. “The bus algorithm”
• Outside baggage claim, catch bus
number 70.
• Transfer to bus 14 on Main Street.
• Get off on Elm street.
• Walk two blocks north to my house.

20. All get you to where
you need to go.