Returns the exponent of the given double value - Java java.lang

Java examples for java.lang:double

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Description

Returns the exponent of the given double value

Demo Code

/*/*w w  w  .j  a  v  a2  s  .c  o  m*/
 * 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.
 */
//package com.java2s;

public class Main {
    /**
     * Returns the exponent of the given value
     *
     * @param value the value to get the exponent from
     * @return the value's exponent
     */
    public static int getExponant(double value) {
        // See Double.doubleToRawLongBits javadoc or IEEE-754 spec
        // to have this algorithm
        long exp = Double.doubleToRawLongBits(value) & 0x7ff0000000000000L;
        exp = exp >> 52;
        return (int) (exp - 1023L);
    }
}

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