Returns the sign for double precision x
import java.math.BigDecimal;
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*
*/
public class Main {
/**
* Returns the <a href="http://mathworld.wolfram.com/Sign.html"> sign</a>
* for double precision <code>x</code>.
* <p>
* For a double value <code>x</code>, this method returns
* <code>+1.0</code> if <code>x > 0</code>, <code>0.0</code> if
* <code>x = 0.0</code>, and <code>-1.0</code> if <code>x < 0</code>.
* Returns <code>NaN</code> if <code>x</code> is <code>NaN</code>.</p>
*
* @param x the value, a double
* @return +1.0, 0.0, or -1.0, depending on the sign of x
*/
public static double sign(final double x) {
if (Double.isNaN(x)) {
return Double.NaN;
}
return (x == 0.0) ? 0.0 : (x > 0.0) ? 1.0 : -1.0;
}
}
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