# coding:utf-8
'''
filename: try_except.py
'''

# while 1:
#     print("this is a division program.")
#     c = input("input 'c' continue, otherwise logout:")
#     if c == 'c':
#         a = input("first number:")
#         b = input("second number:")
#         try:
#             print(float(a)/float(b))
#             print("*************************")
#         except ZeroDivisionError:
#             print("The second number can't be zero!")
#             print("*************************")
#         except ValueError:
#             print("please input number.")
#             print("************************")
#     else:
#         break

while 1:
    print("this is a division program.")
    c = input("input 'c' continue, otherwise logout:")
    if c == 'c':
        a = input("first number:")
        b = input("second number:")
        try:
            print(float(a)/float(b))
            print("*************************")
        except (ZeroDivisionError, ValueError) as e:
            print(e)
            print("********************")
    else:
        break