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#! /usr/bin/python2.7

# Print digits of pi forever.
#
# The algorithm, using Python's 'long' integers ("bignums"), works
# with continued fractions, and was conceived by Lambert Meertens.
#
# See also the ABC Programmer's Handbook, by Geurts, Meertens & Pemberton,
# published by Prentice-Hall (UK) Ltd., 1990.

import sys

def main():
    k, a, b, a1, b1 = 2, 4, 1, 12, 4
    while True:
        # Next approximation
        p, q, k = k*k, 2*k+1, k+1
        a, b, a1, b1 = a1, b1, p*a+q*a1, p*b+q*b1
        # Print common digits
        d, d1 = a//b, a1//b1
        while d == d1:
            output(d)
            a, a1 = 10*(a%b), 10*(a1%b1)
            d, d1 = a//b, a1//b1

def output(d):
    # Use write() to avoid spaces between the digits
    sys.stdout.write(str(d))
    # Flush so the output is seen immediately
    sys.stdout.flush()

if __name__ == "__main__":
    main()