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86 lines
2.4 KiB
Java
86 lines
2.4 KiB
Java
/*
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Copyright 2007-2010 Rustici Software, LLC
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Author(s):
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Kevin Glynn (kevin.glynn@scorm.com)
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*/
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package RusticiSoftware.System;
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public class NumberSupport {
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// public static float round(float num, int places) {
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// long factor = (long)Math.pow(10,places);
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// return Math.round(num * factor) / factor;
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// }
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/**
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* Round a double value to a specified number of decimal
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* places.
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*
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* @param val the value to be rounded.
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* @param places the number of decimal places to round to.
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* @return val rounded to places decimal places.
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*/
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public static double round(double val, int places) {
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long factor = (long)Math.pow(10,places);
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// Shift the decimal the correct number of places
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// to the right.
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val = val * factor;
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// Round to the nearest integer.
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long tmp = Math.round(val);
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// Shift the decimal the correct number of places
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// back to the left.
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return (double)tmp / factor;
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}
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/**
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* Format a number
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*
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* @param n the value to be formatted.
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* @param format a C# standard numeric format string.
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* @return n formatted according to C# format string.
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* @throws NotImplementedException
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*/
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public static String format(Number n, String format) throws NotImplementedException {
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String fStr = null;
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switch (format.charAt(0)){
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case 'X':
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case 'x':
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fStr = String.format("%1$0" + format.substring(1) + format.charAt(0), n);
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break;
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default:
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throw new NotImplementedException("No implementation for " + format + " format string");
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}
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return fStr;
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}
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public static void main(String args[]) throws NotImplementedException {
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double f = 10.123456789d;
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System.out.println(f + " turns into " + round(f,3));
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for (int i = 0; i <= 255; i++) {
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byte b = (byte)i;
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System.out.println(b + " turns into " + format(b,"X2"));
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}
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}
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}
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