Python雖然循環到相等數

Question

我試圖讓用戶輸入數字，直到它等於999.出於某種原因，輸入的第一個數字沒有註冊並出現在0.我知道我已經將它設置爲0，但那是爲了將程序推入循環。

counter = 0 
equals = 0 
while equals < 999: 
    equals = equals + counter 
    print(equals) 
    if counter < 998: 
     counter = eval(input("Enter numbers to equal 999")) 
    else: 
     print("number entered is equal or over 999") 

Answer 1

它打印0在第一次迭代，因爲你print(equals)之前從輸入讀取它。所以：

counter = 0 
equals = 0 
while equals < 999: 
    if counter < 998: 
     counter = int(input("Enter numbers to equal 999")) 
    else: 
     print("number entered is equal or over 999") 
    equals = equals + counter 
    print(equals)