Python虽然循环到相等数

Question

我试图让用户输入数字，直到它等于999.出于某种原因，输入的第一个数字没有注册并出现在0.我知道我已经将它设置为0，但那是为了将程序推入循环。

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，因为你print(equals)之前从输入读取它。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)