您將需要添加一種方法，讓用戶退出并中斷循環，但while True將循環多長時間。在while True:

# let user decide if they want to continue or quit

x = input("Pick a number from (1,2,3,4) or enter 'q' to quit:")

if x == "q":

print("Goodbye")

break

x = int(x)

if x == 1:

print ("You are finding the Radius.")

ra = int(input("Enter the arch length: "))

rd = int(input("Enter the degree: "))

rr = ra/math.radians(rd)

print ("The Radius is:",rr)

elif x == 2: # use elif, x cannot be 1 and 2

print ("You are finding the Arch Length.")

sr = int(input("Enter the radius: "))

sd = int(input("Enter the degree: "))

ss = math.radians(sd)*sr

print ("The Arch Length is:",ss)

elif x == 3:

.....

elif x == 4:

.....

如果要使用循環，還可以使用try/except驗證用戶是否只輸入了有效的輸入：

^{pr2}$

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