84 lines
1.6 KiB
Python
84 lines
1.6 KiB
Python
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class NumberException(Exception):
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pass
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class NumericSystemException(Exception):
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pass
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class Zahlensystem:
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chars = map(str, range(0,10)) + map(chr, range(ord('A'), ord('F')+1))
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def __init__(self, basis):
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self.basis = int(basis)
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if self.basis > 16 or self.basis < 2:
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raise NumberException("Numeric system %d is invalid" % (self.basis,))
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def fromNum(self, num):
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if type(num) != str:
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num = str(num)
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if "." in num:
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pre, post = num.split(".",2)
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else:
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pre = num
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post = ""
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value = 0
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for i,c in enumerate(pre):
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e = (len(pre)-i-1)
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try:
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f = self.chars[:self.basis].index(c.upper())
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except ValueError:
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raise NumberException("%d isn't a %d based number" % (f,self.basis))
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value += f * self.basis**e
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for i,c in enumerate(post):
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e = (-i-1)
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try:
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f = self.chars[:self.basis].index(c.upper())
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except ValueError:
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raise NumberException("%d isn't a %d based number" % (f,self.basis))
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value += f * self.basis**e
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return value
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def toNum(self, num):
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num = float(num)
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if num < 0:
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neg = True
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num = -num
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else:
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neg = False
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pre, post = divmod(num, 1)
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v = ""
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if pre != 0:
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n = pre
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while n != 0:
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n, r = divmod(n, self.basis)
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v = self.chars[int(r)] + v
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else:
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v = "0"
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if post != 0:
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v = v + "."
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n = post
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while n != 0:
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r, n = divmod(n * self.basis, 1)
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v = v + self.chars[int(r)]
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if neg:
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v = "-" + v
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return v
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if __name__ == '__main__':
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num = raw_input("Num> ")
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fr = int(raw_input("From> "))
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to = int(raw_input("To> "))
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print Zahlensystem(to).toNum(Zahlensystem(fr).fromNum(num))
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