Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/**
 * Copyright 2008 - 2011
 * 
 * Licensed 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.
 * 
 * @project loonframework
 * @author chenpeng
 * @emailceponline@yahoo.com.cn
 * @version 0.1
 */

public class Main {
    static final int TK1 = 13323;
    static final int TK2 = 20810;

    public static int tan(int f) {
        int sqr = mul(f, f);
        int result = TK1;
        result = mul(result, sqr);
        result += TK2;
        result = mul(result, sqr);
        result += (1 << 16);
        result = mul(result, f);
        return result;
    }

    static public final float tan(float angle) {
        return (float) Math.tan(angle);
    }

    public static int mul(int x, int y) {
        long z = (long) x * (long) y;
        return ((int) (z >> 16));
    }
}