1.使用while输出1 2 3 4 5 6 ... 10
count = 1
while count <=10 :
if count == 7:
print(" ")
else:print(count)
count +=1
2.求1-100的和
count =1
sum = 0
while count <=100 :
sum += count
count+=1
print(sum)
3.输出1-100的所有奇数
num=1
while num<=100 :
if num%2!=0 :
print(num)
num+=1
4.求1-2+3-4...99的所有数之和
num = 1
sum = 0
flag=1
while num <= 99:
sum+=num*flag
flag=flag * -1
num+=1
print(sum)
5.用户登录(三次重试机会)假设密码账户均为admin
count = 3
while True :
user = input("请输入账号")
password = input("请输入密码")
if user == "admin" and password == "admin" :
print("登录成功")
break
else:
count -= 1
if count!=0:
print("你还有", count, "次机会")
else:
print("登录失败")
break