day1-习题

# 1、使用while循环输入 1 2 3 4 5 6     8 9 10
count = 1
while count<11 :     #使用while语句循环输入123...10
    if count == 7:   # 使用if语句中的pass,将7跳过不输入
        pass
    else:
        print(count)
    count +=1
print('-------end-------')
##################
# 2、求1-100的所有数的和
temp = 1
sum = 0
while temp <101:
    sum = sum+temp
    temp +=1
print(sum)
print('-------end-------')
#################
# 3、输出 1-100 内的所有奇数
count = 1
while count<101:
    n = count %2
    if n==0:
        pass
    else:
        print(count)
    count +=1
print('-------end-------')
# 4、输出 1-100 内的所有偶数
count = 1
while count < 101:
    n = count%2

    if n==0:
        print(count)
    else:
        pass
    count += 1
print('-------end-------')
################
# 5、求1-2+3-4+5 ... 99的所有数的和
count = 1
sum1 = 0
sum2 = 0
sum = 0
while count <100:

    if count %2:
        sum1=sum1+count
    else:
        sum2 = sum2 +count
    sum = sum1 - sum2
    count += 1
print (sum)
print('-------end-------')

m =1
s=0
while m<100:
    j = m%2
    if j==0:
        s = s -m
    else:
        s = s +m
    m = m +1
print(s)
print('-------end-------')

#6.用户登陆（三次机会重试）
count = 0
while count<3:
    user_id = input('请输入用户名：')
    password = input("请输入密码：")
    if user_id =='mada' and password == '':
        print('登录成功')
        break
    else :
        print('用户名或密码错误，请重新输入')
    count +=1