day1 用户登陆三次机会

1、使用while循环输入1 2 3 4 5 6  8 9 10

#使用while循环输入1 2 3 4 5 6  8 9 10
n = 1
while n <= 10:
    if n != 7:
        print (n)
    n += 1

 

2、求1—100的所用数的和

#求1—100的所用数的和
n = 1
m = 0
while n <= 100:
    m += n
    n += 1
print (m)

3、输出1—100内的所用奇数

#输出1—100内的所用奇数
n = 1
while n <= 100:
    if n%2 != 0:
        print (n)
    n += 1

4、输出1—100内的所用偶数

#输出1—100内的所用偶数
n = 1
while n <= 100:
    if n%2 ==0:
        print (n)
    n += 1

5、求1-2+3-4+5-6+7-8 ... 99的所用数的和

#求1-2+3-4+5-6+7-8 ... 99的所用数的和
n = 1
m = 0
while n <100:
    if n%2 != 0:
        m += n
    else:
        m -= n
    n += 1
print (m)

6、用户登陆（有三次机会重试）

#用户登陆（有三次机会重试）
n = 1
while n <=3:
    name = input（“please enter name")
    pwd = input ("please enter password")
    if name == "kingo" and pwd == "kingo":
        print ("welcome, kingo!")
        break;
    else:
        print ("name or password is wrong!")
    n += 1
else:
    print ("the times is over!")