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18 lines
276 B
Plaintext
18 lines
276 B
Plaintext
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## PI approximation using Leibniz formula.
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##
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## PI/4 = 1 - 1/3 + 1/5 - 1/7 + 1/9 - ...
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from math import abs
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pi_by_4 = 0; sign = -1
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for i in 1..10000
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sign *= -1
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pi_by_4 += sign * 1/(2*i - 1)
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end
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PI = 4 * pi_by_4
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assert(abs(PI - 3.141593) < 0.0002)
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print('PI =', PI)
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