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#!/usr/bin/env python

# coding=utf-8

"""

try... except

"""

while 1:

print "this is a division program."

c = raw_input("input 'c' continue, otherwise logout:")

if c == 'c':

a = raw_input("first number:")

b = raw_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:

print "some wrong..."

print "********************"

else:

break