Class 7 – Wednesday, September 11

Make Bill Murray proud

Take another step — Chrestomathics awaits you — Feel the momentum

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Look both ways

• Back or ahead

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Agenda

• Continue exploration of the basics of problem solving — getting data, performing computation, and displaying information. Along the way we will develop an appreciation for expression evaluation and formulation

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Downloads

• Program temperature.py

• Program drops.py

• Program whats_the_point.py

• Program break_the_bank.py

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Survey

• Please take it

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Office hours

Monday	Tuesday	Wednesday	Thursday	Friday
12:00-14:00 R. Green	17:00-19:00 B. Nielsen	15:30-17:30 S. Rogers	16:00-18:00 N. Hassan	09:00-11:00 A. Hoang
16:30-18:30 R. McNamara		18:00-20:00 J. Seaman	10:00-12:00 H. Khoung
			14:30-16:30 V. Donnelly

Location Thornton A Stacks

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To do list

• Review class artifacts

• Finish homework

• Check out other Python built-in functions

• Reread about Python string capabilities.

• Reread problem-solving epistle

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Problem notes

Program temperature.py

• Prompts user for a integer Celsius temperature and separately computes its integer and decimal Fahrenheit equivalent using the formula

• Two different possible runs

Enter Celsius temperature: 24

24 C = 75.2 F

24 C = 75 F

Enter Celsius temperature: 8

8 C = 46.4 F

8 C = 46 F

 

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Program whats_the_point.py

• Prompts user for a decimal value and echoes (displays) the value back showing on separate lines 5, 4, 3, 2, 1, and 0 decimal places of accuracy. It finally displays the number rounded to an integer.

• FYI: there is a built-in Python function round() that can take one or two arguments. The first argument is the value to be rounded, the second optional value is the wanted number of places after the decimal. When a second value is not supplied, it rounds to an integer.

• Three different possible runs

Enter number: 3.14159265359

3.14159265359

3.14159

3.1416

3.142

3.14

3.1

3.0

3

Enter number: -3.14159265359

-3.14159265359

-3.14159

-3.1416

-3.142

-3.14

-3.1

-3.0

-3

Enter number: 4.998234

4.998234

4.99823

4.9982

4.998

5.0

5.0

5

5.0

 

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Program drops.py

• Prompts user for an integer number of gallons of interest. The program computes and prints the number of drops of water for the indicated amount. Assume there are 90,922 drops of water per gallon. FYI

• A standard bathtub can hold eighty gallons of water

• The Atlantic Ocean holds about 93701099000000000000000000000 gallons of water

• Three different possible runs

Enter number of gallons(integer): 1

90922

Enter number of gallons(integer): 80

7273760

Enter number of gallons(integer): 93701099000000000000000000000

8519491323278000000000000000000000

 

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Program break_the_bank.py

• With a single prompt, it gets from the user four values in the following order: number of quarters, dimes, nickels, and pennies. Computes and displays how much the coinage is worth.

• Two different possible runs

Number of quarters, dimes, nickels, and pennies: 27 14 28 18

Coinage

    27 quarters

    14 dimes

    28 nickels

    18 pennies

are worth 9.73 dollars

Number of quarters, dimes, nickels, and pennies: 1 2 3 4

Coinage

    1 quarters

    2 dimes

    3 nickels

    4 pennies

are worth 0.6400000000000001 dollars

• For those who dislike Python's approximation in the second test run, use the built-in round() function.

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© 2019 Jim Cohoon

Resources from previous semesters are available.