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func is_int (n, tolerance=0) {
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!!(abs(n.real.round + n.imag - n) <= tolerance)
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}
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%w(25.000000 24.999999 25.000100 -2.1e120 -5e-2 Inf NaN 5.0+0.0i 5-5i).each {|s|
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var n = Number(s)
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printf("%-10s %-8s %-5s\n", s,
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is_int(n),
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is_int(n, tolerance: 0.00001))
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}
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