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problem_set3.md

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CS50P - Problem Set 3

Fuel Gauge

Implement a program that prompts the user for a fraction, formatted as X/Y, wherein each of X and Y is an integer, and then outputs, as a percentage rounded to the nearest integer, how much fuel is in the tank.

  • If X or Y is not an integer, X is greater than Y, or Y is 0, instead prompt the user again
  • Catch ValueError and ZeroDivisionError
  • If 1% or less remains, output E
  • If 99% or more remains, output F

num, deno = fraction.split("/")
print(f"{percent(num, deno)}")
except (ValueError, ZeroDivisionError):
return str(prct) + "%"

Felipe's Taqueria

Implement a program that enables a user to place an order, prompting them for items, one per line, until the user inputs cmd-d (which is a common way of ending one’s input to a program).

  • After each inputted item, display the total cost of all items inputted this far, prefixed with a dollar sign $ and formatted to two decimal places.
  • Treat the user’s input case insensitively
  • Ignore any input that isn't an item.
  • Assume that every item on the menu will be titlecased

Dictionary values can be str, int, float, etc.

total = 0
if order in tacos:
	    total += tacos[order]
	    print(f"Total: ${total:.2f}")
	else:
	    continue
except EOFError

Grocery List

Implement a program that prompts the user for items, one per line, until the user inputs cmd-d.

  • Then output the user’s grocery list in all UPPERCASE
  • Sorted alphabetically by item
  • Prefixing each line with the number of times the user inputted that item. No need to pluralize the items.
  • Treat the user's input case-insensitively.

items_list = [ ]

final_items = { }
items_list.append(item)
except EOFError
sorted(items_list)
for item in items_list:
    if item in final_items:
        final_items[item] += 1
    else:
        final_items[item] = 1
for item in final_items.keys():
    print(f"{final_items[item]} {item}")

Outdated

Implement a program that prompts the user for a date in month-day-year order, formatted like 9/8/1636 or September 8, 1636

  • Then output the same date in YYYY-MM-DD format.
  • If the user’s input is not a valid date in either format, prompt the user again.
  • Assume that every month has no more than 31 days; no need to validate whether a month has 28, 29, 30 or 31 days.
If days > 31 = reprompt
If months > 12 = reprompt
If date is in wrong format = reject

except ValueError
list.index(x) # Returns index of first occurrence of x
split("/")
print(f"{year}-{month:02}-{day:02}") # n:02 notation adds 0 prefix if single integer 
date = date.replace(",", "") # Replaces "," by nothing
date_parts = date.split(" ") # Splits string from whitespace and creates a list of elements
month, day, year = date_parts # Renames date_parts[0] month, date_parts[1] day and date_parts[2] year
months.index(month)  # Returns index of element