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Chapter 3: Problem 6

Write a program that allows a user to enter a string containing a day of the week ("Sunday," "Monday," "Tuesday," etc.) and uses a switch construct to convert the day to its corresponding number, where Sunday is considered the first day of the week and Saturday is considered the last day of the week. Print out the resulting day number. Also, be sure to handle the case of an illegal day name! (Note: Be sure to use the 's' option on function input so that the input is treated as a string.)

Short Answer

Expert verified
To create a program that converts a day of the week (as a string) to its corresponding number using a switch construct, follow these steps: 1. Get user input for the day of the week and store it as a string variable. 2. Convert the string input to lowercase for easy comparison. 3. Create a switch construct using a dictionary to compare the input with each day of the week and assign the corresponding number. 4. Include a case for handling invalid input and print an error message. 5. Print the day number. Example code in Python: ```python def main(): day = input("Enter a day of the week: ").strip().lower() switch = { "sunday": 1, "monday": 2, "tuesday": 3, "wednesday": 4, "thursday": 5, "friday": 6, "saturday": 7 } day_number = switch.get(day, 'invalid') if day_number == 'invalid': print("Invalid day name!") else: print("The corresponding number is:", day_number) if __name__ == "__main__": main() ``` Note: Python uses a dictionary as an alternative to a native switch construct.

Step by step solution

01

Get user input for the day of the week

Ask the user to enter a day of the week and store it as a string variable.
02

Convert the string input to lowercase

Convert the given input to lowercase so that it is easier to compare and manage the cases in the switch construct (e.g. "monday", "Monday", "MONDAY" will all be the same).
03

Create a switch construct

Set up a switch construct to compare the input with each day of the week (in lowercase) and assign the corresponding number for each day, where Sunday is 1 and Saturday is 7.
04

Case for invalid input

In the switch construct, also create a case for handling invalid input, which will print an error message to inform the user that the input is not a valid day name.
05

Print the day number

Print out the day number/result of the switch construct. Here's an example code for this program in Python: ```python def main(): day = input("Enter a day of the week: ").strip().lower() switch = { "sunday": 1, "monday": 2, "tuesday": 3, "wednesday": 4, "thursday": 5, "friday": 6, "saturday": 7 } day_number = switch.get(day, 'invalid') if day_number == 'invalid': print("Invalid day name!") else: print("The corresponding number is:", day_number) if __name__ == "__main__": main() ``` Note that Python doesn't have a native switch construct, so we use a dictionary as an alternative.

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