50 lines
1.5 KiB
Java
50 lines
1.5 KiB
Java
/* ====================================================================
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package org.apache.poi.hssf.record.formula.functions;
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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 final class Even extends NumericFunctionOneArg {
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private static final long PARITY_MASK = 0xFFFFFFFFFFFFFFFEL;
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protected double evaluate(double d) {
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if (d==0) {
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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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result = calcEven(d);
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} else {
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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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long x = ((long) d) & PARITY_MASK;
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if (x == d) {
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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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