I have a more simple-minded solution. The error appears to occur in testing without revealing the problem by use of $1 base price in the test. Using $10,000 as the base price in the test reveals absurd numbers. I think the real problem lies in the inclusion of base price inappropriately, twice as in:
>dealerPrep = basePrice + 500 >destinationCharge = basePrice + 250 "basePrice" has no place in those two lines. 500 and 250 alone express the definition of the challenge. Ken In <mailman.13.1449939602.12987.tu...@python.org>, on 12/12/15 at 12:00 PM, tutor-requ...@python.org said: >Send Tutor mailing list submissions to > tutor@python.org >To subscribe or unsubscribe via the World Wide Web, visit > https://mail.python.org/mailman/listinfo/tutor >or, via email, send a message with subject or body 'help' to > tutor-requ...@python.org >You can reach the person managing the list at > tutor-ow...@python.org >When replying, please edit your Subject line so it is more specific than >"Re: Contents of Tutor digest..." >Today's Topics: > 1. Calculation error with a simple program (Jim Gallaher) > 2. Re: Calculation error with a simple program (Alan Gauld) > 3. Re: Calculation error with a simple program (Laura Creighton) >---------------------------------------------------------------------- >Message: 1 >Date: Sat, 12 Dec 2015 01:03:05 -0600 >From: Jim Gallaher <jcgallahe...@gmail.com> >To: tutor@python.org >Subject: [Tutor] Calculation error with a simple program >Message-ID: <566bc6a9.6090...@gmail.com> >Content-Type: text/plain; charset=utf-8; format=flowed >Hi everyone. I'm reading through a beginners Python book and came up with >a super simple program. I'm not getting any errors and everything runs >through, but there's a logical calculation error. What the program does is >take an amount and calculate a couple percentages and add a couple fees. >For example, if I put in a value of 1, it will output 752.12 as the sub >total and 753.12 as the grand total. It's off by 1 on sub total and 2 on >grand total. >Thanks in advance! Jim Gallaher ># Car Salesman Calculator ># User enters the base price of the car and the program adds tax, license, >dealer prep, and destination charge. >print("Car Sales Calculator") >basePrice = int(input("Please enter in the price of the car: ")) ># Misc charges to be added to the total cost of the car >tax = basePrice * .07 >license = basePrice * .05 >dealerPrep = basePrice + 500 >destinationCharge = basePrice + 250 ># Add the total misc charges together >subTotal = float(tax + license + dealerPrep + destinationCharge) ># Add all the misic charges and include the base price >grandTotal = float(subTotal + basePrice) ># Display the results >print("\nThe sub total is", subTotal) >print("\nYour grand Total is", grandTotal) >input("\nPress the enter key to close the program.") >------------------------------ >Message: 2 >Date: Sat, 12 Dec 2015 08:04:52 +0000 >From: Alan Gauld <alan.ga...@btinternet.com> >To: tutor@python.org >Subject: Re: [Tutor] Calculation error with a simple program >Message-ID: <n4gkf4$e99$1...@ger.gmane.org> >Content-Type: text/plain; charset=utf-8 >On 12/12/15 07:03, Jim Gallaher wrote: >> For example, if I put in a value of 1, it will output 752.12 as the sub >> total and 753.12 as the grand total. It's off by 1 on sub total and 2 on >> grand total. >Are you sure? Lets check the values... >> basePrice = int(input("Please enter in the price of the car: ")) >=> 1 >> tax = basePrice * .07 >=> 0.07 >> license = basePrice * .05 >=> 0.05 >> dealerPrep = basePrice + 500 >=> 501 >> destinationCharge = basePrice + 250 >=> 251 >> # Add the total misc charges together >> subTotal = float(tax + license + dealerPrep + destinationCharge) >=> 0.07 + 0.05 + 501 + 251 => 752.12 >> # Add all the misic charges and include the base price >> grandTotal = float(subTotal + basePrice) >=> 752.12 + 1 => 753.12 >Looks like Python got it right to me? -- ----------------------------------------------------------- K.F.Hammer Associates Ken Hammer management consultations Saint Johnsbury, VT 05819 ----------------------------------------------------------- _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
