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CS50P - Problem Set 1

Deep Thought

Implement a program that prompts the user for the answer to the Great Question of Life, the Universe and Everything, outputting Yes if the user inputs 42 or (case insensitively) forty-two or forty two. Otherwise No.

.lower()
.strip()

Home federal Savings Bank

Implement a program that prompts the user for a greeting. If the greeting starts with "hello", output 0$. If the greeting starts with an "h" (but not hello), output 20$. Otherwise output 100$.

  • Ignore leading whitespace
  • case-insensitive
.strip()
.lower()
startswith()

File Extensions

Implement a program that prompts the user for the name of a files and then outputs that file’s media type if the file’s name ends, case-insensitively, in any of these suffixes:

.gif = image/gif  
.jpg = image/jpg
.jpeg = image/jpeg
.png = image/png
.pdf = application/pdf
.txt = text/plain
.zip = application/zip

If the file name ends with some other suffix at all, output application/octet-stream instead.

partition(".") # Splits string at first dot . 
rpartition(".") # Splits string at last dot .
media = f"image/{suffix}"

Math Interpreter

Implement a program that prompts the user for an arithmetic expression and then calculates and outputs the result as a floating-point value formatted to one decimal place.

Assume that the user’s input will be formatted as x y z with one space between x and y and one space between y and z:

X is an integer
Y is +,-,*, or /
Z is an integer

.split(" ")
return f"{result:.1f}"

Meal Time

Implement a program that prompts the user for a time and outputs whether it's breakfast time, lunch time, or dinner time.

  • If it's not time for a meal, don't output anything at all.

  • User input formatted in 24-hour time as #:## or ##:##.

  • convert(time) : converts 07:30 string into 7.5 float

  • Each meal's time range in inclusive :

7:00 - 8:00 Breakfast
12:00 - 13:00 Lunch
18:00 - 19:00 Dinner

__name__ has two "_"