Here you can find the source of doubleToFractionStr(final Double d)
| Parameter | Description |
|---|---|
| d | The double to convert into a string fraction. |
public static String doubleToFractionStr(final Double d)
//package com.java2s; /**/*www . ja va 2 s . c o m*/ * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ public class Main { /** Factor to use when converting doubles to fraction strings. */ private static final int FACTOR = 100000; /** * Converts a double to a string fraction, i.e. this converts 0.5 into a * string reading "1/2". * * @param d The double to convert into a string fraction. * * @return The supplied double as a fraction string. */ public static String doubleToFractionStr(final Double d) { boolean negative = false; Double v = d; // Determine if we are dealing with a negative value. if (v < 0) { negative = true; v = -v; } // Determine the the fraction: "whole numerator/denominator" int w = (int) ((v - Math.floor(v)) * FACTOR); int gcd = gcd(w, FACTOR); int whole = (int) Math.floor(v); int numerator = w / gcd; // If a negative value was supplied, display a '-'. String result = ""; if (negative) { result += "-"; } // If we have a whole number component add it to the output. if (whole != 0) { result += whole; } // If we have a whole part, and a fraction add a spacer to the output. if (whole != 0 && numerator != 0) { result += " "; } else if (whole == 0 && numerator == 0) { result = "0"; } // If we have a fraction component, add it to the output. if (numerator != 0) { int denominator = FACTOR / gcd; result += numerator + "/" + denominator; } return result; } /** * Determines the greatest common divisor of two integers. * * @param a The first of two digits to determine the divisor. * @param b The second of two digits to determine the divisor of. * * @return The greatest common divisor of the two supplied arguments. */ public static int gcd(final int a, final int b) { if (b == 0) { return a; } else { return gcd(b, a % b); } } }