計算信用卡還款的二分法

我參加了課程6.00.1x計算機科學與程序設計入門。我被要求提出一個計劃，計算一年內償還信用卡餘額所需的最低還款額。爲此，我需要使用二分法。計算信用卡還款的二分法

我想出了這段代碼（請看下面）。當我運行代碼時，我得到29591.55作爲答案;然而，我打算得到29157.09。

任何人都可以幫助我解決問題嗎？

balance = 320000 
annualInterestRate = 0.2 
monthlyInterestRate = annualInterestRate/12.0 
lowerRepayment = balance/12 
upperRepayment = (balance * (1 + monthlyInterestRate)**12)/12 
repayment = (lowerRepayment + upperRepayment)/2 
unpaidBalance = balance 
while unpaidBalance >= 0: 
    repayment = round(((lowerRepayment + upperRepayment)/2), 2) 
    unpaidBalance = balance 
    numberOfRepayments = 0 
    while numberOfRepayments < 12 and unpaidBalance >= 0: 
     numberOfRepayments += 1 
     monthlyUnpaidBalance = unpaidBalance - repayment 
     increment = monthlyUnpaidBalance * monthlyInterestRate 
     unpaidBalance = monthlyUnpaidBalance + increment 
    if unpaidBalance < -0.01: 
     lowerRepayment = repayment 
    elif unpaidBalance > 0.01: 
     upperRepayment = repayment 
print 'Lowest Payment: ' + str(repayment)

來源

2013-11-03 user2949713

選擇一個：http：//stackoverflow.com/search？q = [python]bisect+credit+card – roippi

@roippi - 謝謝。我看過其他帖子，但我仍然沒有得到29157.09的答案。 – user2949713

這是一個提示。無論何時'unpaidBalance <0'，外部'while'循環結束，無論'還款'金額是否正確。 – martineau

你不得不改變條件如果unpaidBalance> 0.01： lowerRepayment =還款 ELIF unpaidBalance < -0.01： upperRepayment =還款 2.make你的循環結束的時候unpaidBalance爲-0.01至0.01之間

來源

2014-03-29 06:01:07 kayakane

計算信用卡還款的二分法

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