Question

我一直在努力寻找一个小循环。我不知道为什么我的while循环不起作用。如果我删除它工作的两个条件中的一个，但是当它们在一起时它不会......

temp = input("Choose between Fahreneit degrees 'f'' key or Celsius degrees 'c' key ")

while temp != "f" or temp != "c" :
 temp = input("you must choose f or c")

if (temp == "f") :
 print("you choosed Fahreneit")
 degF = int(input("What is the temperature outside?"))
 print("It seems that the temperature is around" , (0.56 * (degF - 32)) ,"Celsius from your Fahreneit sample")

elif (temp == "c") :
 print("you choosed Celsius")
 degC = int(input("What is the temperature outside?"))
 while degC < -273 or degC > 5500 :
  degC = int(input("Please enter a correct value"))

print("it seems that the temperature is around" , (1.8 * (degC) + 32) , "Fahreneit from your Celsius sample")

Answer 1

temp != "f" or temp != "c"与temp == "f" or temp == "c"不同。有关否定布尔表达式的指导，请参阅De Morgan's laws。

尝试：

while temp != "f" and temp != "c":

或者只是：

while not (temp == "f" or temp == "c"):

或完全跳过布尔头痛：

while temp not in ("f", "c"):

while循环有2个条件

1 个答案: