Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * 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 {
    /**
     * Array of powers of ten. Using double instead of float gives a tiny bit more precision.
     */
    private static final double[] pow10 = new double[128];

    /**
     * Computes a float from mantissa and exponent.
     */
    public static float buildFloat(int mant, int exp) {
        if (exp < -125 || mant == 0) {
            return 0.0f;
        }

        if (exp >= 128) {
            return (mant > 0) ? Float.POSITIVE_INFINITY : Float.NEGATIVE_INFINITY;
        }

        if (exp == 0) {
            return mant;
        }

        if (mant >= (1 << 26)) {
            mant++; // round up trailing bits if they will be dropped.
        }

        return (float) ((exp > 0) ? mant * pow10[exp] : mant / pow10[-exp]);
    }
}