练习题第一天

1、使用while循环输入 1 2 3 4 5 6 8 9 10

#-*- coding:utf-8 -*-
n = 1
while n < 11:
　　if n == 7:
　　　　pass
　　else:
　　　　print(n)
　　n = n + 1

print('----end----')

2、求1-100的所有数的和

n = 1
s = 0
while n < 101:
	s = s + n
	n = n + 1
print(s)

3、输出 1-100 内的所有奇数

while n < 101:
	temp = n % 2
	if temp == 0:
		pass
	else:
		print(n)
	n = n + 1
print('----end----')

4、输出 1-100 内的所有偶数

n = 1
while n < 101:
	temp = n % 2
	if temp == 0:
		print(n)
	else:
		pass
	n = n + 1
print('----end----')

5、求1-2+3-4+5 ... 99的所有数的和

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

　

6、用户登陆（三次机会重试）

count = 0
while count < 3:
	user = raw_input('username:')
	pwd = raw_input('password:')
	if user == 'rock' and pwd == '123456':
		print('欢迎登陆')
		print('哈哈哈哈')
		break
	else:
		print('out!!!')
		count = count + 1