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34 lines
924 B
Python
Executable file
34 lines
924 B
Python
Executable file
#! /usr/bin/env python
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# Print digits of pi forever.
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#
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# The algorithm, using Python's 'long' integers ("bignums"), works
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# with continued fractions, and was conceived by Lambert Meertens.
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#
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# See also the ABC Programmer's Handbook, by Geurts, Meertens & Pemberton,
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# published by Prentice-Hall (UK) Ltd., 1990.
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import sys
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def main():
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k, a, b, a1, b1 = 2L, 4L, 1L, 12L, 4L
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while 1:
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# Next approximation
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p, q, k = k*k, 2L*k+1L, k+1L
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a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
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# Print common digits
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d, d1 = a/b, a1/b1
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while d == d1:
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output(d)
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a, a1 = 10L*(a%b), 10L*(a1%b1)
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d, d1 = a/b, a1/b1
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def output(d):
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# Use write() to avoid spaces between the digits
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# Use str() to avoid the 'L'
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sys.stdout.write(str(d))
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# Flush so the output is seen immediately
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sys.stdout.flush()
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if __name__ == "__main__":
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main()
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