num1 = int(input('請輸入第一個數(shù):'))
num2 = int(input('請輸入第二個數(shù):'))
max_num = max(num1, num2)
min_num = min(num1, num2)
r = max_num % min_num
while r != 0:
    max_num = min_num
    min_num = r
    r = max_num % min_num
print(num1, "和", num2, "的最大公約數(shù)為", min_num)

#1
num1 = input('請輸入一個數(shù):')
lenth = len(num1)
a = []
for i in num1:
    a.append(i)
a.reverse()    #使列表反轉
str1 =''
for i in a:
    str1 += i
print(int(str1))

#2
number_new=num1[::-1]     #切片
print(number_new)

#3
new_num = 0
num1 = int(num1)
while num1 :
   #對num1求余數(shù)，第一次循環(huán)則把個位求出來
   last = num1 % 10
   #new_num這個變量，第一次將last放在個位，第二次放在十位，依次遞增。
   new_num = new_num * 10 + last
   #對num1求余后取整，保證下一位在下一個循環(huán)被取出
   num1=num1 // 10
print(new_num)

for i in range(21):
   for j in range(21):
      if i + j > 20 and c:
         print('{} + {} = {}'.format(i,j,i+j))

b = ['周一','周二','周三','周四','周五']
sum = 0
for i in range(5):
   a = int(input(f'{b[i]}的學習時間:'))
   sum += a
pingjun = sum / 5
print("平均學習時間:",pingjun)

for i in range(1,1000):
   sum = 1
   for j in range(1,i):
      if i % j == 0:
         sum += j

   if sum == i:
      print(f"{i}是完全數(shù)")

c = []
a = int(input('你正在玩第一局，成績?yōu)?'))

c.append(a)
for i in range(4):
   b = input('繼續(xù)玩嗎(y,n):')
   if b == 'y':
      print('進行下一局')
      a = int(input(f'你正在玩第{i+2}局，成績?yōu)?'))
      c.append(a)
   else:
      print('很遺憾，你沒能完成游戲')
      break
sum = 0
for i in c:
   if i >= 80:
     sum += 1
if sum / len(c) >= 0.8:
   print('一級')
elif sum / len(c) >= 0.6:
   print('二級')
else:
   print('不能晉級')

a = True
while a:
   print('歡迎進入學生管理系統(tǒng)')
   print('1登錄 2注冊 3退出 ')
   num = int(input('請選擇:'))
   if num == 3:
      print("退出系統(tǒng)")
      a = False
   elif num == 1:
      print('恭喜登錄成功')
   elif num == 2:
      print('恭喜注冊成功')

for i in range(1,7):
   for j in range(i):
      print(i-j,end='')
   print()