1.使用while循环输入1 2 3 4 5 6 8 9 10
s = 0
while s < 10:
s = s + 1
if s == 7:
continue
print(s)
2.求1-100的所有数和
s = 1
sum = 0
while s <= 100:
sum = sum + s
s = s + 1
print(sum)
3.输出1-100内的所有奇数
a = 1
s = 2
while a <= 100:
if a % 2 == 1:
print(a)
a = a + 1
4.输出1-100内的所有偶数
a = 1 s = 2 while a <= 100: if a % 2 == 0: print(a) a = a + 1
5.求1-2+3-4+...99的所有数的和
a = 1 b = 1 s = 2 sum1 = 0 sum2 = 0 while a <= 100: if a % 2 == 1: sum1 = sum1 + a a = a + 1 while b < 100: if b % 2 == 0: sum2 = sum2 + b b = b + 1 sum3 = sum1 - sum2 print(sum3)
6.用户登录(三次机会重试)
count = 1
while count <= 3:
user = input("请输入您的用户名:")
password = input("请输入您的密码:")
if user == "lin" and password == "110120":
print("登录成功")
break
else:
print("用户名或密码错误,请重新输入")
count = count + 1