Question

# This program takes the original principal,
# calculates the annual interest rate 
# calculates the number of times the interest is compounded
# calculates how many years the account will earn interest
# and lastly displays the ending principal


# Input the original principal.

original_principal = int(input( 'Enter the starting principal: ' ))

# Input the annual interest rate.

annual_interest = float(input( 'Enter the annual interest rate: ' ))

# Input times per year the interest is compounded.

compound = int(input( 'How many times per year is the interest compounded? ' ))

# Input number of years account will earn interest.

total_years = int(input( 'For how many years will the account earn interest? ' ))

# Calculate ending principle amount after earning annual
# interest for a specified amount of years.

ending_principal = original_principal * (1 + annual_interest / compound) ** \
               (compound * annual_interest)

#Display the ending principle amount.

print ( 'At the end of 2 years you will have $' , \
    format(ending_principal, ',.2f'))

我使用1,000美元作为我的original_principal（仅作为示例），并且应该得到期望的结尾$ 1，051.22。

然而，我远不及那个数字。我的猜测是我在计算中的某个地方错过了一个括号。如果我没有正确格式化这段代码，我会事先道歉，这是我第二次使用堆栈溢出，仍在学习。

Answer 1

这是固定代码。兴趣需要以小数计算。

# This program takes the original principal,
# calculates the annual interest rate
# calculates the number of times the interest is compounded
# calculates how many years the account will earn interest
# and lastly displays the ending principal


# Input the original principal.

original_principal = int(input('Enter the starting principal: '))

# Input the annual interest rate.

annual_interest = float(input('Enter the annual interest rate (%): '))
annual_interest = annual_interest / 100

# Input times per year the interest is compounded.

compound = int(input('How many times per year is the interest compounded? '))

# Input number of years account will earn interest.

total_years = int(input('For how many years will the account earn interest? '))

# Calculate ending principle amount after earning annual
# interest for a specified amount of years.

ending_principal = (original_principal * (1 + annual_interest
                                      / compound) ** (compound * total_years)
                    )

# Display the ending principle amount.

print('At the end of ', total_years, 'years you will have $',
      format(ending_principal, '.2f'))

使用Python计算每月复利计算

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