基础练习题

1.使用while循环输入1234568910

a = 1
while a <= 10:
   if a == 7:
       pass
   else:
       print(a)
   a = a + 1

2.输出1-100以内的奇数

a = 1
while a <= 100:
    if a%2 == 0:
        pass
    else:
        print(a)
    a = a + 1

3.输出1-100以内的偶数

a = 1
while a <= 100:
    if a%2 == 0:
        print(a)
    else:
        pass
    a = a + 1

4.输出1-100所有数字相加之和

a = 1
sum = 0
while a <= 100:
    sum = sum + a
    a = a + 1
print (sum)

5.输出1-2+3-4+5.....99的和

a = 1
sum = 0
while a < 100:
    temp = sum % 2
    if temp == 0:
        sum = sum - a
    else :
        sum = sum + a
    a = a + 1
print (sum)
   

 6.用户登陆，三次机会重试

count = 0
while count < 3 :
    user = input('请输入用户名>>>:')
    pwd = input('请输入密码>>>:')
    if user == 'zjh' and pwd == '123456':
        print('登陆成功')
        print('........')
    else:
        print('用户名或密码错误')
    count = count + 1