How might I convert a double to the nearest integer value

Question

How do you convert a double into the nearest int

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I m developing a scientific calculator that sports an Int button   I ve found the following is a simple  reliable solution   double dblInteger  if  dblNumber  lt  0      dblInteger   Math Ceiling dblNumber   else    dblInteger   Math Floor dblNumber     Math Round sometimes produces unexpected or undesirable results  and explicit conversion to integer  via cast or Convert ToInt     often produces wrong values for higher-precision numbers   The above method seems to always work

User · Answer

For Unity  use Mathf RoundToInt   using UnityEngine   public class ExampleScript   MonoBehaviour       void Start                    Prints 10         Debug Log Mathf RoundToInt 10 0f               Prints 10         Debug Log Mathf RoundToInt 10 2f               Prints 11         Debug Log Mathf RoundToInt 10 7f               Prints 10         Debug Log Mathf RoundToInt 10 5f               Prints 12         Debug Log Mathf RoundToInt 11 5f                Prints -10         Debug Log Mathf RoundToInt -10 0f               Prints -10         Debug Log Mathf RoundToInt -10 2f               Prints -11         Debug Log Mathf RoundToInt -10 7f               Prints -10         Debug Log Mathf RoundToInt -10 5f               Prints -12         Debug Log Mathf RoundToInt -11 5f              Source  public static int RoundToInt float f    return  int Math Round f

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double d   1 234  int i   Convert ToInt32 d     Reference  Handles rounding like so       rounded to the nearest 32-bit signed integer  If value is halfway   between two whole numbers  the even number is returned  that is  4 5   is converted to 4  and 5 5 is converted to 6

User · Answer

You can also use function     Works with negative numbers now static int MyRound double d      if  d  lt  0        return  int  d - 0 5         return  int  d   0 5       Depending on the architecture it is several times faster

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double d  int rounded    int Math Round d

User · Answer

Use Math round    possibly in conjunction with MidpointRounding AwayFromZero  eg   Math Round 1 2     gt  1 Math Round 1 5     gt  2 Math Round 2 5     gt  2 Math Round 2 5  MidpointRounding AwayFromZero     gt  3

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I know this question is old  but I came across it in my search for the answer to my similar question  I thought I would share the very useful tip that I have been given   When converting to int  simply add  5 to your value before downcasting  As downcasting to int always drops to the lower number  e g   int 1 7    1   if your number is  5 or higher  adding  5 will bring it up into the next number and your downcast to int should return the correct value   e g   int  1 8    5     2

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Methods in other answers throw OverflowException if the float value is outside the Int range  https   docs microsoft com en-us dotnet api system convert toint32 view netframework-4 8 System Convert ToInt32 System Single   int result   0  try       result   Convert ToInt32 value     catch  OverflowException        if  value  gt  0  result   int MaxValue      else result   int Minvalue

[c#] How might I convert a double to the nearest integer value?

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