计算credi余额的程序

Question

如果一个人每月只支付信用卡公司要求的最低月供，写一个程序来计算一年后的信用卡余额。

我想写一个程序，打印出一年后的最后余额

balance = 4213

annualInterestRate = 0.2

monthlyPaymentRate = 0.04

month = 1

new_balance = (balance - (balance*monthlyPaymentRate))*(1+(annualInterestRate/12))


while month < 13:
    print "Month: " + str(month)
    print "Minimum monthly payment: " + str(round(minimum_monthly_payment, 2))
    print "Remaining balance: " + str(round(new_balance, 2))
    month += 1

我的输出显示：

Month: 1
Minimum monthly payment: 168.52
Remaining balance: 4111.89

Month: 2
Minimum monthly payment: 168.52
Remaining balance: 4111.89

Month: 3
Minimum monthly payment: 168.52
Remaining balance: 4111.89

但我应该得到这样的东西：

Month: 1
Minimum monthly payment: 168.52
Remaining balance: 4111.89

Month: 2
Minimum monthly payment: 164.48
Remaining balance: 4013.2

Month: 3
Minimum monthly payment: 160.53
Remaining balance: 3916.8

Answer 1

看起来你的价值观没有更新，因为你忘了每月更新余额！尝试在每个循环中更新一次balance变量，如下所示：

while month < 13:
    print "Month: " + str(month)
    print "Minimum monthly payment: " + str(round(minimum_monthly_payment, 2))
    print "Remaining balance: " + str(round(balance, 2))
    balance = (balance - (balance*monthlyPaymentRate))*(1+(annualInterestRate/12))
    month += 1

此外，为了使您的代码更易于阅读（并且更容易理解Python），您可以使用Python的内置列表结构，而不是使用自己的while循环：

for month in range(1, 13):
    print "Month: %d" % month
    print "Minimum monthly payment: %d" % round(minimum_monthly_payment, 2)
    print "Remaining balance: %d" % round(balance, 2)
    balance = (balance - (balance * monthlyPaymentRate)) * (1 + (annualInterestRate / 12)