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Control Structures in Python

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Join Date: Aug 2009

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smuteekaanya smuteekaanya is offline

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Control Structures in Python

Aug 14th, 2009

The following program has two mistakes in it that cause it to print an incorrect answer.

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
# Computes how much interest is earned on a given amount of principal.
principal = float(raw_input('Enter principal: '))
interestRate = float(raw_input('Enter interest rate as a percent: '))
years = int(raw_input('Enter number of years: '))
totInterest = 0.0
curYear = 0
while curYear <= years:
annualInterest = principal * interestRate
totInterest = totInterest + annualInterest
principal = principal + annualInterest
curYear = curYear + 1
print 'Total interest in ' + str(years) + ' year(s): $' + str(totInterest)
# Computes how much interest is earned on a given amount of principal.
principal = float(raw_input('Enter principal: '))
interestRate = float(raw_input('Enter interest rate as a percent: '))
years = int(raw_input('Enter number of years: '))
totInterest = 0.0
curYear = 0
while curYear <= years:
annualInterest = principal * interestRate
totInterest = totInterest + annualInterest
principal = principal + annualInterest
curYear = curYear + 1
print 'Total interest in ' + str(years) + ' year(s): $' + str(totInterest)

How do I correctly write the program to give me $100 for it is the correct answer.

Thanks,
MS

Last edited by John A; Aug 21st, 2009 at 12:28 am. Reason: added code tags

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sknake

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Re: Control Structures in Python

Aug 20th, 2009

Welcome to daniweb! Please use code tags when posting code on daniweb.

[code]
...code here...
[/code]

For your question -- that depends on what your inputs are. What is the principal, interest, years?

Scott Knake
Custom Software Development
Apex Software, Inc.

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smuteekaanya smuteekaanya is offline

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Re: Control Structures in Python

Aug 20th, 2009

Principal is 1000
Interest rate as a percent is 10
Number of years is 1
Total interest in 1 year is $120000.0

P.S. Sorry for my inability to code it

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Re: Control Structures in Python

Aug 21st, 2009

I suggest this

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
# Computes how much interest is earned on a given amount of principal.
principal = float(raw_input('Enter principal: '))
interestRate = float(raw_input('Enter interest rate as a percent: ')) / 100
years = int(raw_input('Enter number of years: '))
totInterest = 0.0
for curYear in range(years):
    annualInterest = principal * interestRate
    totInterest = totInterest + annualInterest
    principal = principal + annualInterest
print 'Total interest in ' + str(years) + ' year(s): $' + str(totInterest)
# Computes how much interest is earned on a given amount of principal.
principal = float(raw_input('Enter principal: '))
interestRate = float(raw_input('Enter interest rate as a percent: ')) / 100
years = int(raw_input('Enter number of years: '))
totInterest = 0.0
for curYear in range(years):
    annualInterest = principal * interestRate
    totInterest = totInterest + annualInterest
    principal = principal + annualInterest
print 'Total interest in ' + str(years) + ' year(s): $' + str(totInterest)

Your 2 mistakes are 1) Your interest rate is 10.0 instead of 0.10 and 2) You compute over 2 years instead of 1.