#!/usr/bin/env python
# coding=utf-8
"""
try... except
"""
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("************************")
except (ZeroDivisionError, ValueError) as e:
print(e)
#print("please input rightly.")
print("********************")
else:
break