基本支票账户余额

Question

我正在尝试编写一个程序来询问起始余额，减去费用。如果用户选择是以获得更多费用，它会正确循环并要求另一个条目。如果用户选择 N，程序将停止并打印起始余额、费用条目总数和所有费用后的期末余额。以下代码全部正确输出，但在所有费用后未输出正确的金额。

# Initialize the accumulator.
account_balance = 0
ending_balance = 0
expense = 0
keep_going = "y"

# Prompt user for account balance.
account_balance = float (input("Enter the starting balance of the account you want to use:"))

# Calculate the balance.
for a in range (1000):    
    while keep_going == "y":

        # Prompt user for an expense.
        purchase = int (input("What is the value of the expense?:"))
        
        # Calculate the remaining balance.
        ending_balance = account_balance - purchase

        #Calculate the total expenses entered.
        expense = expense + 1

        # Ask if user has another expense.
        keep_going = input("Do you have another expense? (Enter y for yes)")                       

if keep_going == "n":
    print("Amount in account before expense subtraction $", format (account_balance, ",.2f"))
    print("Number of expenses entered:", expense)

    print("Amount in account AFTER expenses subtracted is $", format (ending_balance, ",.2f"))

# Pseudo Code

# Prompt user to enter amount in account in which money will be withdrawn from
# Prompt user to enter amount of first expense
# Subtract expense from account
# Ask user if they would like to add another expense
    # If "yes" then ask user to add expense
    # If "no" then display the following
        # Amount in account BEFORE expenses
        # Number of transactions made
        # Amount in account AFTER all expenses are subtracted

Answer 1

如果你想让账户余额作为起始余额，那么它需要始终保持起始余额，期末余额应该是更新的。

# Initialize the accumulator.
account_balance = 0
ending_balance = 0
expense = 0
keep_going = "y"

# Prompt user for account balance.
account_balance = float (input("Enter the starting balance of the account you want to use:"))
# set ending balance to be the starting balance at the beginning
ending_balance = account_balance

# Calculate the balance.
for a in range (1000):    
    while keep_going == "y":

        # Prompt user for an expense.
        purchase = int (input("What is the value of the expense?:"))

        # Update the ending balance instead
        ending_balance = ending_balance - purchase

        #Calculate the total expenses entered.
        expense = expense + 1

        # Ask if user has another expense.
        keep_going = input("Do you have another expense? (Enter y for yes)")                       

if keep_going == "n":
    print("Amount in account before expense subtraction $", format (account_balance, ",.2f"))
    print("Number of expense entered:", expense)
    print("Amount in account AFTER expenses subracted is $", format (ending_balance, ",.2f"))