第12节 while循环

例1

count=0
while True:
   print("count:",count)
   count=count+1 // count+=1
输出结果：
count: 230033
count: 230034
count: 230035
count: 230036
count: 230037
count: 230038
count: 230039
count: 230040

　　

例2：

age_of_oldboy=56
count=0
while True:
   if count==3 :
      break
   guess_age=int(input("guess_age:"))
   if age_of_oldboy==guess_age:
       print("yes,you got it")
       break
   elif age_of_oldboy>guess_age:
       print("think smaller")
   else:
       print("think older")
   count+=1
输出结果：
guess_age:56
yes,you got it

　　

例3：

age_of_oldboy=56
count=0
while count<3 : //不要忘记：，在这里直接隐含着等于3的时候break，执行了3次
    guess_age=int(input("guess_age:"))
   if age_of_oldboy==guess_age:
      print("yes,you got it")
      break
  elif age_of_oldboy>guess_age:
      print("think smaller")
  else:
     print("think older")
  count+=1
输出结果：
guess_age:1
think smaller
guess_age:58
think older
guess_age:56
yes,you got it

　　

 

例4：

age_of_oldboy=56
count=0
while count<3 :
    guess_age=int(input("guess_age:"))
    if age_of_oldboy==guess_age:
       print("yes,you got it")
       break
    elif age_of_oldboy>guess_age:
       print("think smaller")
   else:
       print("think older")
    count+=1
else:
print("you have tried too many times!") //如果while的条件符合 就输出while里面的，如果不符合就输出you have tried too many times!


输出结果：
guess_age:1
think smaller
guess_age:2
think smaller
guess_age:3
think smaller
you have tried too many times!

输出结果：
guess_age:1
think smaller
guess_age:56
yes,you got it //没有输出you have tried too many times!