while循环练习

1、使用while循环输入1 2 3 4 5 6    8 9  10

num = 1
while num <= 10:
    if num == 7:
        print(" ")
    else:
        print(num)
    num = num + 1

2、求1-100的所有数的和

num = 1
he = 0
while num <= 100:
    he = he + num
    num = num +1
print("1-100的和为:",he)

3、输出1-100内的所有奇数

num = 1
he = 0
while num <= 100:
    if (num%2) != 0:
        he = he + num
    num = num + 1
print("1-100内所有奇数和：",he)

4、输出1-100内的所有偶数

num = 1
he = 0
while num <= 100:
    if (num%2) == 0:
        he = he + num
    num = num + 1
print("1-100内所有偶数和：",he)

5、求1+2+3.....+99+100的所有数的和

num = 1
he = 0
while num <= 100:
    if (num%2) != 0:
        he = he + num
    else:
        he = he - num
    num = num +1
print("1-2+3-4+5...+33-100的和为：",he)

6、用户登录（三次机会）

num = 1
while num <= 3:
    name = input("请输入用户名：")
    password = input("请输入密码：")
    if name == "张三" and password == "111111":
        print("欢迎")
        break
    else:
        if num != 3:
            print("用户名或密码错误，请重新登录")
        else:
            print("用户名或密码输入错误超过三次，请1分钟后再试")
    num = num +1