第一天作业

1.求1-100的总和

count = 0
int = 0
while count < 100:
    count += 1
    #print(count)
    int += count
    print(int)

2.使用while循环输出1 2 3 4 5 6 8 9 10

count = 0
while count < 10:
    count += 1
    if count == 7:
        continue #到循环首，不执行下方代码
    print(count)

count = 0
while count < 10:
    count += 1
    if count == 7:
        pass #跳过
    else:
        print(count)

3.取奇数偶数

count = 0
while count < 100:
    count += 1
    if count % 2 == 0:
        print('偶数：'+  str(count))
    else:
        #pass
        print('奇数：'+  str(count))

count = 1
while count < 100:
    print(count)
    count += 2

 4.1-2+3-4+5-6。。。。99的总和

sum = 0
count = 0
while count < 99:
    count += 1
    #print(count)
    if count % 2 == 0:
        sum -= count #如果为偶数就减
    else:
        sum += count #如果为奇数就+
print(sum)
#最后结果为50

5.3次机会猜数字游戏

print('接下来我们进行一个猜数字的游戏')
print('你共有3次机会，猜出我心中所想的1-10其中一个')
count = 0
while count < 3:
    ni = int(input('请输入1-10其中一个数字：'))
    if ni == 8:
        print('恭喜你猜对了！')
        break
    else:
        print('猜错了！你还有' + str(2-count) + '次机会')
    count += 1

count = 0
while count < 3:
    username = input('请输入账号：')
    password = input('请输入密码：')
    if username == '陈俊' and password == '123':
        print('登录成功！')
        break
    elif count == 2:
        print('错误次数超过3次!')
    else:
        print('登录失败,请检查！你还有' + str(2-count) + '次输入机会!')
    count += 1