我的程序在 3-10 C 之間給出了錯誤的答案

Question

我在 3 天前開始編程。 這顯示了 3-10 C 之間的錯誤結果，我該如何解決？

x = input("what C is it today: ")
if x < str(20):
    print("Its cold")
    print("Wear a jacket")
if str(20) <= x < str(30):
    print("Its a nice day")
    print("don't forget to have fun")
if x >= str(30):
    print("Its hot")
    print("open the air conditioner")

Answer 1

而不是使用str(20), ...使用int(x) 。

發生這種情況是因為比較字符串與字符串有點不同。

嘗試如下：

x = input("what C is it today: ")
x = int(x) # here we cast x to an Integer

if x < 20:
    print("Its cold", "Wear a jacket") # you can pass multiple value 
if 20 <= x < 30:
    print("Its a nice day", "don't forget to have fun")
if x >= 30:
    print("Its hot", "open the air conditioner")

Answer 2

正如 Mehrdad 所說， input() 假定您輸入的內容是一個字符串。 所以你應該將輸入轉換為 int 類型。

而且我可以發現您可以對代碼進行的其他改進。 例如：對相互關聯/在排除過程中的條件使用elif和else語句（比如如果不是1，就是2）

x = int( input("what C is it today: ") ) # input (string to integer)


if x < 20:
    print("Its cold", "Wear a jacket") # you can pass multiple value 
elif 20 <= x < 30:
    print("Its a nice day", "don't forget to have fun")
else: # this condition is not needed, because we eliminated the possibilities that x is less than 30, so everything else that passes the two above statements are 30 or above.
    print("Its hot", "open the air conditioner")