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  1. using System;
  2.  
  3. public class Test
  4. {
  5. 	public static void Main()
  6. 	{
  7. 		foreach (var test in new[]{ "1", "1.5", "2.125", "3 7/8", "5/16" })
  8.         {
  9.             Console.WriteLine("{0,-5} = {1:0.000}", test, new FractionalNumber(test));
  10.         }
  11. 	}
  12. }
  13.  
  14.     public class FractionalNumber
  15.     {
  16.         public Double Result
  17.         {
  18.             get { return this.result; }
  19.             private set { this.result = value; }
  20.         }
  21.         private Double result;
  22.  
  23.         public FractionalNumber(String input)
  24.         {
  25.             this.Result = this.Parse(input);
  26.         }
  27.  
  28.         private Double Parse(String input)
  29.         {
  30.             input = (input ?? String.Empty).Trim();
  31.             if (String.IsNullOrEmpty(input))
  32.             {
  33.                 throw new ArgumentNullException("input");
  34.             }
  35.  
  36.             // standard decimal number (e.g. 1.125)
  37.             if (input.IndexOf('.') != -1 || (input.IndexOf(' ') == -1 && input.IndexOf('/') == -1 && input.IndexOf('\\') == -1))
  38.             {
  39.                 Double result;
  40.                 if (Double.TryParse(input, out result))
  41.                 {
  42.                     return result;
  43.                 }
  44.             }
  45.  
  46.             String[] parts = input.Split(new[] { ' ', '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);
  47.  
  48.             // stand-off fractional (e.g. 7/8)
  49.             if (input.IndexOf(' ') == -1 && parts.Length == 2)
  50.             {
  51.                 Double num, den;
  52.                 if (Double.TryParse(parts[0], out num) && Double.TryParse(parts[1], out den))
  53.                 {
  54.                     return num / den;
  55.                 }
  56.             }
  57.  
  58.             // Number and fraction (e.g. 2 1/2)
  59.             if (parts.Length == 3)
  60.             {
  61.                 Double whole, num, den;
  62.                 if (Double.TryParse(parts[0], out whole) && Double.TryParse(parts[1], out num) && Double.TryParse(parts[2], out den))
  63.                 {
  64.                     return whole + (num / den);
  65.                 }
  66.             }
  67.  
  68.             // Bogus / unable to parse
  69.             return Double.NaN;
  70.         }
  71.  
  72.         public override string ToString()
  73.         {
  74.             return this.Result.ToString();
  75.         }
  76.  
  77.         public static implicit operator Double(FractionalNumber number)
  78.         {
  79.             return number.Result;
  80.         }
  81.     }
Success #stdin #stdout 0.04s 34736KB
comments (?)
stdin
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Standard input is empty
stdout
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1     = 1
1.5   = 1.5
2.125 = 2.125
3 7/8 = 3.875
5/16  = 0.3125
https://ideone.com/TSJ1MT
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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