day00 -----博客作业1

问题1、使用while循环输入 1 2 3 4 5 6     8 9 10

i  = 0
while i<10:
    i+=1
    if i ==7:
        continue
    print(i)

问题2 求1-100的所有数的和

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

问题3   输出 1-100 内的所有奇数

i  = 0
while i <100:
    i  = i +1
    num  = i %2
    if num ==1:
        print(i)

问题4  输出 1-100 内的所有偶数

i  = 0
while i <100:
    i  = i +1
    num  = i %2
    if num ==0:
        print(i)

问题5  求1-2+3-4+5 ... 99的所有数的和

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

问题6 用户登陆（三次机会重试）

password = 123
conunt = 3
while conunt>0:
    conunt = conunt-1
    shru = input('请输入密码')

    if shru == password:
        print('zhengque')

    elif conunt >0:
        print('输入不正确')
        print('你还有%s 次机会' % (conunt))
    else:
        print('所有机会都用完了,退出程序')

 升级版..

zhanhao = 'wang'
password  = 123
jishu = 3
while jishu>0:
    jishu = jishu -1
    shuru1 = input('请输入账号')
    shuru2 = input('请输入密码')
    if shuru1 ==zhanhao  and shuru2 ==password:
        print('输入正确')
    elif jishu >0:
        print('输入错误,你还有%s次机会'%(jishu))
    else:print('3次机会用完了 程序退出')