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60 lines
1.6 KiB
60 lines
1.6 KiB
/*
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* Licensed to the Apache Software Foundation (ASF) Under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for Additional information regarding copyright ownership.
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* The ASF licenses this file to You Under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed Under the License is distributed on an "AS Is" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations Under the License.
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*/
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/*
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* Created on May 6, 2005
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*
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*/
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namespace NPOI.SS.Formula.Functions
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{
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/**
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* @author Amol S. Deshmukh < amolweb at ya hoo dot com >
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*
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*/
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public class Even : OneArg
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{
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private const long PARITY_MASK = unchecked((long)0xFFFFFFFFFFFFFFFEL);
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public override double Evaluate(double d)
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{
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if (d == 0)
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{
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return 0;
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}
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long result;
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if (d > 0)
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{
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result = calcEven(d);
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}
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else
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{
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result = -calcEven(-d);
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}
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return result;
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}
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private static long calcEven(double d)
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{
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long x = ((long)d) & PARITY_MASK;
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if (x == d)
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{
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return x;
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}
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return x + 2;
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}
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}
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}
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