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  1. using System;
  2.  
  3. public class Test
  4. {
  5. 	public static void Main()
  6. 	{
  7. 		for (decimal x = 1 ; x != 2 ; x+=0.01M) {
  8. 			decimal y = CashRound(x);
  9. 			Console.WriteLine("{0:0.00} {1:0.00}", x, y);
  10. 		}
  11. 	}
  12.  
  13.     public static decimal CashRound(decimal value, decimal cents = 0.05m)
  14.     {
  15.       var roundedValue = Math.Truncate(value * 100) / 100; // ensure internal value has 2 decimals
  16.  
  17.       var modToCents = roundedValue * 100 % (cents * 100);
  18.       if (modToCents == 0)
  19.         return roundedValue;
  20.       else if (modToCents < 3)
  21.         roundedValue -= modToCents / 100;
  22.       else if (modToCents < 8)
  23.         roundedValue += cents - modToCents / 100;
  24.       else
  25.         roundedValue += modToCents / 100;
  26.  
  27.       return roundedValue;
  28.     }
  29. }
Success #stdin #stdout 0.03s 26596KB
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Standard input is empty
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1.00 1.00
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1.33 1.35
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1.58 1.60
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1.63 1.65
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1.68 1.70
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1.97 1.95
1.98 2.00
1.99 2.00
https://ideone.com/Wwb3MJ
language:
C# (gmcs 5.20.1)
created:
13 days ago
visibility:
public

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