3.17 作业习题

Q1. 使用while循环输入：1 2 3 4 5 6 8 9 10

count = 0
while count < 10:
    count = count + 1
    if count == 7:
      continue
    print(count)

Q2. 求1-100所有数的和

#1-100求和
first = 1
sum = 0
while first <= 100:
    sum += first
    first += 1
    print(sum)

count = 0
while count < 100:
    count = count + 1
    s=((count+1)*count/2)
print(s)

Q3.输出1-100内所有奇数

Q4 输出1-100内所有偶数

Q3
count = 0
while count < 100:
	count = count + 1
	if count %2 != 0: #奇数	
		print(count)　　
Q4

count = 0
while count < 100:
    count = count +1
    if count %2 == 0:
        print(count)

Q5 #求1-2+3-4...99
a = 1
sum = 0
while a < 100:
    
    if a %2 == 0: #even
        sum = sum - a
    else:
        sum = sum + a #odd
    a = a + 1        
print(sum)

#用户登陆三次机会
count=0
while count < 3:
	username = input('enter your name')
	password = input ('enter your password')
	if username == 'Nero'and password == '123':
		print('success')
		break
	else:
		count=count+1
		print('error')