python之路 - while,for循环小习题
程序员文章站
2022-07-14 23:35:34
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#1、使用while循环输入 1 2 3 4 5 6 8 9 10
#2.求1-100的所有数的和
#3.输出 1-100 内的所有偶数
#4输出 1-100 内的所有奇数
#5.求1-2+3-4+5 ... 99的所有数的和
#6。用户登陆(三次机会重试)"""
n = 1
while n < 11:
if n == 7:
pass
else:
print(n)
n = n + 1
#2.求1-100的所有数的和
sum = 0
for i in range(1,101):
sum += i
print (sum)
#3.输出 1-100 内的所有偶数
for i in range(1,101):
if i % 2 == 0:
print (i)
#4输出 1-100 内的所有奇数
for i in range(1,101):
if i % 3 == 0:
print(i)
#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)
#------------------------------------------------
n = 0
for i in range(1,100):
if i % 2 == 0:
n -= i
else:
n += i
print(n)
#6。用户登陆(三次机会重试)"""
num = 0
while True:
user = input("UserName:")
pwd = input("PassWord:")
if user == "root" and pwd == "123":
print ("登录成功...")
break
elif num > 2:
print ("用户名或密码错误...")
print ("输入次数达到上限,退出程序...")
break
else:
print ("用户名或密码错误,请重新输入...")
num += 1
continue