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$n1 = 0; $n2 = 0; ... printf("%17.13f %17.13f\n", $n1, $n2); }
... 99.6999999999986 498.5000000000000 99.7999999999986 499.0000000000000 99.8999999999986 499.5000000000000 99.9999999999986 500.0000000000000