using System;namespace TT.Entity
{/// <summary>/// 分数类/// </summary>public class Fraction{#region propertyprivate double _denominator;/// <summary>/// 分母/// </summary>public double Denominator{get{return _denominator;}set{if (value == 0){throw new InvalidOperationException("分母不能为0");}_denominator = value;}}/// <summary>/// 分子/// </summary>public double Numerator { get; set; }#endregion#region constructorpublic Fraction(){}/// <summary>/// 创建分数(默认分母为1)/// </summary>/// <param name="numerator">分子</param>public Fraction(double numerator){Numerator = numerator;_denominator = 1;}/// <summary>/// 创建分数/// </summary>/// <param name="numerator">分子</param>/// <param name="denominator">分母</param>public Fraction(double numerator, double denominator){Numerator = numerator;_denominator = denominator;}#endregion#region method/// <summary>l/// 相加/// </summary>/// <param name="d1"></param>/// <param name="d2"></param>/// <returns></returns>public Fraction Add(double d1, double d2){return Add(new Fraction(d1), new Fraction(d2));}/// <summary>///  计算两个数的相减,并返回一个分数/// </summary>/// <param name="minuend">被减数</param>/// <param name="subtrahend">减数</param>/// <returns></returns>public Fraction Sub(double minuend, double subtrahend){return Sub(new Fraction(minuend), new Fraction(subtrahend));}/// <summary>/// 计算两个数的相乘,并返回一个分数/// </summary>/// <param name="d1"></param>/// <param name="d2"></param>/// <returns></returns>public Fraction Multiple(double d1, double d2){return Multiple(new Fraction(d1), new Fraction(d2));}/// <summary>/// 计算两个数的相除,并返回一个分数/// </summary>/// <param name="dividend">被除数</param>/// <param name="divisor">除数</param>/// <returns></returns>public Fraction Divided(double dividend, double divisor){return Divided(new Fraction(dividend), new Fraction(divisor));}public string GetFractionValueString(){return string.Format("{0}/{1}", Numerator, Denominator);}public double GetFractionValue(){return Numerator / Denominator;}/// <summary>/// 计算两个分数的相加,并返回一个分数/// </summary>/// <param name="f1"></param>/// <param name="f2"></param>/// <returns></returns>public Fraction Add(Fraction f1, Fraction f2){Fraction result = new Fraction();double dencominator = CalculateLeaseCommonMultiple(f1.Denominator, f2.Denominator);f1.Numerator = (dencominator / f1.Denominator) * f1.Numerator;f2.Numerator = (dencominator / f2.Denominator) * f2.Numerator;result.Denominator = dencominator;result.Numerator = f1.Numerator + f2.Numerator;return result;}/// <summary>///  计算两个分数的相减,并返回一个分数/// </summary>/// <param name="minuend">被减数</param>/// <param name="subtrahend">减数</param>/// <returns></returns>public Fraction Sub(Fraction minuend, Fraction subtrahend){Fraction result = new Fraction();double dencominator = CalculateLeaseCommonMultiple(minuend.Denominator, subtrahend.Denominator);minuend.Numerator = (dencominator / minuend.Denominator) * minuend.Numerator;subtrahend.Numerator = (dencominator / subtrahend.Denominator) * subtrahend.Numerator;result.Denominator = dencominator;result.Numerator = minuend.Numerator - subtrahend.Numerator;return result;}/// <summary>/// 计算两个分数的相乘,并返回一个分数/// </summary>/// <param name="f1"></param>/// <param name="f2"></param>/// <returns></returns>public Fraction Multiple(Fraction f1, Fraction f2){Fraction result = new Fraction();double dencominator = f1.Denominator * f2.Denominator;result.Denominator = dencominator;result.Numerator = f1.Numerator * f2.Numerator;return result;}/// <summary>/// 计算两个分数的相除,并返回一个分数/// </summary>/// <param name="dividend">被除数</param>/// <param name="divisor">除数</param>/// <returns></returns>public Fraction Divided(Fraction dividend, Fraction divisor){Fraction result = new Fraction();double dencominator = dividend.Denominator * divisor.Numerator;result.Denominator = dencominator;result.Numerator = dividend.Numerator * divisor.Denominator;return result;}#endregion#region private/// <summary>/// 计算最小公倍数/// </summary>/// <param name="d1"></param>/// <param name="d2"></param>/// <returns></returns>private double CalculateLeaseCommonMultiple(double d1, double d2){double result = Math.Max(d1, d2);double i = 1D;do{if (result % d1 == 0D&& result % d2 == 0D){break;}else{result *= (++i);}} while (true);return result;}#endregion}
}