语言基础day1 练习题

#使用while循环输出1 2 3 4 5 6 8 9 10 （方法1）

1 count = 1
2 while count < 11:
3     print(count)
4     count = count + 1
5     if count == 7:
6         count = count + 1
7 print("----end----")

#使用while循环输出1 2 3 4 5 6 8 9 10 （方法2）

1 count = 1
2 while count < 11:
3     if count == 7:
4         pass
5     else:
6         print(count)
7     count = count + 1
8 
9 print("----end----")

#输出1-100 内的所有奇数

1 count = 1
2 while count < 101:
3     if count % 2 != 0:
4         print(count)
5     count = count +1

#输出1-100 内的所有偶数

1 count = 1
2 while count < 101:
3     if count % 2 == 0:
4         print(count)
5     count = count +1

#求1-100的所有数的和

1 count = 1
2 a = 0
3 while count < 101:
4     a = a + count
5     count = count +1
6 print(a)

#求1-2+3-4+5 ... 99的所有数的和（方法1）

 1 count = 1
 2 a = 0
 3 b = 0
 4 while count < 100:
 5     if count % 2 != 0:
 6         a = count + a
 7         count = count + 1
 8     else:
 9         b = b -count
10         count = count + 1
11 print(a+b)

#求1-2+3-4+5 ... 99的所有数的和（方法2）

 1 count = 1
 2 a = 0
 3 while count < 100:
 4     temp = count % 2
 5     if temp == 0:
 6         a = a - count
 7     else:
 8         a = a + count
 9     count = count + 1
10 
11 print(a)

#用户登录（三次机会）

 1 user_id = "zxf"
 2 pass_word = "123"
 3 count = 3
 4 name = input("请输入账号：")
 5 mima = input("请输入密码：")
 6 while count > 1:
 7     count = count -1
 8     if name == user_id and mima == pass_word:
 9         print("欢迎登录")
10         count = 0
11     elif name != user_id or mima != pass_word and count > 2:
12         print("账号或密码不正确请重试") 
13         name = input("请输入账号：")
14         mima = input("请输入密码：")
15     if count == 1:
16         print("错误多次无法登录。")