Question

In this exercise, you will test and debug a Future Value Program.

The pseudocode of the program is as follows: Display user message WHILE user wants to continue           get monthly investment, yearly interest rate, and years           convert yearly interest rate to monthly interest rate           convert years to months           set the future value to zero           FOR each month                     add monthly investment amount to future value                     calculate interest for month                     add interest to future value           display future value           ask if user wants to continue Display end message

Test Plan Case Input Expected User entry for monthly_investment Not a number Error, program stops User entry for yearly interest rate Not a number Error, program stops User entry for number of years Not a number Error, program stops User entry for monthly_investment Not >0 and <=1000 Display a message accordingly, ask user to start over User entry for yearly interest rate Not >0 and <=15 Display a message accordingly, ask user to start over User entry for number of years Not >0 and <=50 Display a message accordingly, ask user to start over User entry for a new calculation Anything other than “y” or “Y” Display “Bye!” User entry for a new calculation ‘y’ Start over User entry for a new calculation ‘Y’ Start over User entries are all valid Enter 100 for Monthly investment, 12 for yearly_interest_rate, and 1 for years Display future value which should be 1280.93. .

Requirements: Open the lp_w08_future_value.py file and review the code. lp_wk08_future_value.py   Thoroughly test the program. You may use the test plan as a guide, then note any inaccurate results that you discover during testing. Debug and fix errors. (Hint: total 5 errors). Each fixed error is worth 8 points. Test the program with the same data to be sure it works correctly. Add an in-line comment on each line where you found the errors. Upload your correct program with comments. Please simply upload the .py file, and do not upload a zipped file

(The source code in the lp_wk08_future_value.py) #!/usr/bin/env python3 choice = "y" while choice == "y": # get monthly investment monthly_investment = float(input(f"Enter monthly investment (0-1000):\t")) if not(monthly_investment > 0 and monthly_investment <= 100): print(f"Entry must be greater than 0 and less than or equal to 1000. " "Please start over.")) continue # get yearly interest rate yearly_interest_rate = float(input(f"Enter yearly interest rate (0-15):\t")) if not(yearly_interest_rate > 0 and yearly_interest_rate <= 15): print(f"Entry must be greater than 0 and less than or equal to 15. " "Please start over.") continue # get years years = int(input(f"Enter number of years (0-50):\t\t")) if not years > 0 or not years <= 15: print(f"Entry must be greater than 0 and less than or equal to 15. " "Please start over.") continue # convert yearly values to monthly values monthly_interest_rate = yearly_interest_rate / 12 months = years * 12 # calculate future value future_value = 0.0 for i in range(1, months): future_value = monthly_investment monthly_interest = future_value * monthly_interest_rate future_value += monthly_interest # display future value print() print("Future value:\t\t\t" + str(round(future_value, 2))) print() # see if the user wants to continue choice = input("Continue? (y/n): ") print() print("Bye!")

Answer 1

##IF YOU ARE SATISFIED WITH THE CODE, KINDLY LEAVE A LIKE, ELSE IF YOU HAVE DOUBTS KINDLY COMMENT.

# I HAVE COMMENTED OUT BY THE SIDE OF THE CODE WHERE THERE IS ERROR

CODE:

choice = "y"
while choice == "y" or choice == "Y": #error here choice can be == "Y" as well
# get monthly investment
monthly_investment = float(input(f"Enter monthly investment (0-1000):\t"))
if not(monthly_investment > 0 and monthly_investment <= 1000): #here is an error!
print(f"Entry must be greater than 0 and less than or equal to 1000. "
"Please start over.") #here is an error!
continue
# get yearly interest rate
yearly_interest_rate = float(input(f"Enter yearly interest rate (0-15):\t"))
if not(yearly_interest_rate > 0 and yearly_interest_rate <= 15):
print(f"Entry must be greater than 0 and less than or equal to 15. "
"Please start over.")
continue
# get years
years = int(input(f"Enter number of years (0-50):\t\t"))
if not years > 0 or not years <= 50: #error here! 15 will be 50
print(f"Entry must be greater than 0 and less than or equal to 50. " #error here! 15 is 50 here
+"Please start over.")
continue

# convert yearly values to monthly values
monthly_interest_rate = yearly_interest_rate / 12   
months = years * 12
# calculate future value
future_value = 0.0
for i in range(1, months+1): #error here! change to month+1
future_value += monthly_investment #error here! should be future_value = future_value + monthly_investment
monthly_interest = future_value * monthly_interest_rate/100 #error here! interest is always divided by 100
future_value += monthly_interest

# display future value
print()
print("Future value:\t\t\t" + str(round(future_value, 2)))
print()

# see if the user wants to continue
choice = input("Continue? (y/n): ")
print()

print("Bye!")

CODE PREVIEW:

CODE OUTPUT: