How to determine if a decimal/double is an integer?

by

For floating point numbers, n % 1 == 0 is typically the way to check if there is anything past the decimal point. 

public static void Main (string[] args)
{
    decimal d = 3.1M;
    Console.WriteLine((d % 1) == 0);
    d = 3.0M;
    Console.WriteLine((d % 1) == 0);
}

Output:

False
True

Update: As @Adrian Lopez mentioned below, comparison with a small value epsilon will discard floating-point computation mis-calculations. Since the question is about double values, below will be a more floating-point calculation proof answer:

Math.Abs(d % 1) <= (Double.Epsilon * 100)

More Related Contents:

  1. C# Singleton Form pattern, how to run 2 and more forms? [closed]
  2. How to generate an Array of Double Arrays in c#? [duplicate]
  3. When should I use a struct rather than a class in C#?
  4. How to get the type of T from a member of a generic class or method
  5. ProcessStartInfo hanging on “WaitForExit”? Why?
  6. How to upload file to server with HTTP POST multipart/form-data?
  7. How to access random item in list?
  8. How do I intercept a method call in C#?
  9. SelectSingleNode returns null when tag contains xmlNamespace
  10. How to get the EXIF data from a file using C#
  11. Getting “type or namespace name could not be found” but everything seems ok?
  12. How big is an object reference in .NET?
  13. How to Validate a DateTime in C#?
  14. Get SSID of the wireless network I am connected to with C# .Net on Windows Vista
  15. ExecuteNonQuery for SELECT sql statement returning no rows
  16. Any reason to use auto-implemented properties over manual implemented properties?
  17. Compile-time and runtime casting c#
  18. Why does Microsoft.Office.Interop.Excel.Application.Quit() leave the background process running?
  19. Check if list contains any of another list
  20. Automated property with getter only, can be set, why?
  21. Calling async method on button click
  22. How to find the difference between two images?
  23. Repository Pattern Step by Step Explanation [closed]
  24. ReadKey InvalidOperationException application does not have a console
  25. Multiple UI Threads – Winforms
  26. How to get current working directory path c#?
  27. Is there a standard “never returns” attribute for C# functions?
  28. C# Method Resolution, long vs int
  29. Are immutable arrays possible in .NET?
  30. How to create a password protected database?

Leave a Comment