取余-美分找零钱问题

#!/usr/bin/env python
# -*- coding:utf-8 -*-

def Dollar():
    num = float(raw_input('Enter cent:'))
    a25 = num//25
    a = num-a25*25
    a10 = a//10
    a=a-a10*10
    a5=a//5
    a1=a-a5*5
    print "25美分: %d" % a25
    print "10美分: %d" % a10
    print "5美分: %d" % a5
    print "1美分: %d" % a1