如何編寫一個程序，不斷從用戶那里獲取輸入，直到所有輸入的總和達到 200

Question

允許用戶輸入的數字是：10、20 和 50。如果輸入任何其他數字，則程序應將其聲明為無效。

我嘗試了以下方法，但似乎沒有成功：

count = 0
total = 0
print("Enter the values of amounts collected")

while True:
    new_number = input('> ')
    count = count + 1
    total = total + int(new_number)
    if total==200 :
        print("You have successfully collected 200")
        break
    if total>200:
        print("Amount collected exceeds 200")
        break

樣本輸入：

> 10
> 50
> 50
> 50
> 10
> 20
> 10

樣品 output：

You have successfully collected 200

樣本輸入：

> 190
...

樣品 output：

Invalid input

樣本輸入：

> 50
> 50
> 50
> 20
> 50

樣品 output：

Amount collected exceeds 200

Answer 1

你只需要嵌套的if條件

total = 0
print("Enter the values of amounts collected")
while total<200:               # Loop in until total < 200
new_number = int(input('> '))
if new_number in [10,20,50]:   # First check input number is in 10,20,50
    total = total + new_number # Then add sum to total

    if total == 200:           # If total = 200 break
        print("You have successfully collected 200")
        break

    elif total >200:           # If total > 200 break
        print("Amount collected exceeds 200")
        break
else:                         # If number not in 10,20,50 then print invalid input
    print("Invalid input")