Returns ten to the power of n for double - Java java.lang

Java examples for java.lang:double

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Description

Returns ten to the power of n for double

Demo Code

/*/*from   w  ww.ja va 2  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 {
    /**
     * Most used power of ten (to avoid the cost of Math.pow(10, n)
     */
    private static final long[] POWERS_OF_TEN_LONG = new long[19];

    /**
     * Returns ten to the power of n
     *
     * @param n the nth power of ten to get
     * @return ten to the power of n
     */
    public static long tenPow(int n) {
        assert n >= 0;
        return n < POWERS_OF_TEN_LONG.length ? POWERS_OF_TEN_LONG[n]
                : (long) Math.pow(10, n);
    }
}

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