编写一个程序来计算客户在购买物品时要支付的总金额清单附有价格

如何解决编写一个程序来计算客户在购买物品时要支付的总金额清单附有价格

"编写一个程序来计算客户在购买商品时要支付的总金额。该程序应显示五 (5) 件商品及其相应价格的列表。用户从列表中选择商品并输入“要购买的商品编号（基于列表）和每件商品的购买数量。此操作将重复进行，直到用户不再选择商品为止。程序将显示客户要支付的总金额。”

这是我需要制作的程序类型，下面是我制作的代码，但是当我选择第二个项目时它停止了，我不知道为什么会这样。

Apple=40.00
Banana=30.00
Fish=100.00
Bread=45.00
Milk=20.00
price=0.00

print("Apple: Php 40.00")
print("Banana: Php 30.00")
print("Fish: Php 100.00")
print("Bread: Php 45.00")
print("Milk: Php 20.00")

while True:
    choice=input('\nChoose an item: Apple,Banana,Fish,Bread,Milk\n')
    if choice == 'Apple':
        choice=input('Would you like to pick another order? y/n\n')
        if choice == 'y':
            choice=input('\nChoose an item: Apple,Milk\n')
        else:
            for cost in price:
                sum += cost
                break
                print("Total cost: Php",sum)
                print(" ")
    elif choice == 'Banana':
        choice=input('Would you like to pick another order? y/n\n')
        if choice == 'y':
            choice=input('\nChoose an item: Apple,sum)
                print(" ")
    elif choice == 'Fish':
        choice=input('Would you like to pick another order? y/n\n')
        if choice == 'y':
            choice=input('\nChoose an item: Apple,sum)
                print(" ")
    elif choice == 'Bread':
        choice=input('Would you like to pick another order? y/n\n')
        if choice == 'y':
            choice=input('\nChoose an item: Apple,sum)
                print(" ")
    elif choice == 'Milk':
        choice=input('Would you like to pick another order? y/n\n')
        if choice == 'y':
            choice=input('\nChoose an item: Apple,sum)
                print(" ")
    else: 
        print("Error!")
    break

解决方法

原因是你在 while 循环结束时中断。当您检查用户是否输入错误时，这应该在您的 else 中。此外，我想分享您的简化代码。我可能会遗漏一两件事，但这是使用字典的基本思想。

#create our dictionary,shopping items as keys and price of items as values
shoppingDict = {"Apple":40.00,"Banana":30.00,"Fish":100.00,"Bread":45.00,"Milk":20.00}
#iterate through the dictionaries items printing them out in a certain format
for k,v in shoppingDict.items():print(f'{k}: Php {v}')
while True:
    #prompt user to enter an item
    choice=input('\nChoose an item: Apple,Banana,Fish,Bread,Milk\n')
    #check if that item is found in the dictionary
    #if so add the key's value(price) to price
    try:price += shoppingDict.get(choice)
    #if the user does not enter a valid item,we will print error
    except KeyError:print('Error')
    #ask them if they want to play again
    if input('Would you like to go again? y/n') == 'n':
        print(f'Total Cost: {price}')
        break

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