Java Double Number Truncate truncate(double value, int precision)

Description

truncate

License

Apache License

Declaration

public static double truncate(double value, int precision) 

Method Source Code

//package com.java2s;
/*//  w ww .  j  ava  2  s  .  co m
 * Copyright @ 2006-2010 by The Jxva Framework Foundation
 * 
 * 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.
 */

public class Main {

    public static float truncate(float value, int precision) {
        return Float.parseFloat(Double.toString(truncate((double) value, precision)));
    }

    public static double truncate(double value, int precision) {
        String str = Double.toString(value);
        String precisionstr = str.substring(str.indexOf('.') + 1);
        if (precisionstr.length() <= precision) {
            return value;
        } else {
            long tmp = Math.round(value * Math.pow(10, precisionstr.length()));
            for (int i = 0; i < precisionstr.length() - precision - 1; i++) {
                tmp /= 10;
            }
            if (tmp % 10 >= 5) {
                tmp /= 10;
                tmp += 1;
            } else {
                tmp /= 10;
            }
            return ((double) tmp) / Math.pow(10, precision);
        }
    }
}

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