Can I convert long to int

Question

I want to convert long to int    If the value of long   int MaxValue  I am happy to let it wrap around    What is the best way

User · Answer

The following solution will truncate to int MinValue int MaxValue if the value is out of Integer bounds   myLong  lt  int MinValue   int MinValue    myLong  gt  int MaxValue   int MaxValue    int myLong

User · Answer

The safe and fastest way is to use Bit Masking before cast     int MyInt    int    MyLong  amp  0xFFFFFFFF     The Bit Mask   0xFFFFFFFF   value will depend on the size of Int because Int size is dependent on machine

User · Answer

It can convert by      Convert ToInt32 method   But it will throw an OverflowException if it the value is outside range of the Int32 Type  A basic test will show us how it works   long   numbers     Int64 MinValue  -1  0  121  340  Int64 MaxValue    int result  foreach  long number in numbers       try            result   Convert ToInt32 number           Console WriteLine  Converted the  0  value  1  to the  2  value  3                         number GetType   Name  number                      result GetType   Name  result               catch  OverflowException          Console WriteLine  The  0  value  1  is outside the range of the Int32 type                        number GetType   Name  number               The example displays the following output        The Int64 value -9223372036854775808 is outside the range of the Int32 type        Converted the Int64 value -1 to the Int32 value -1        Converted the Int64 value 0 to the Int32 value 0        Converted the Int64 value 121 to the Int32 value 121        Converted the Int64 value 340 to the Int32 value 340        The Int64 value 9223372036854775807 is outside the range of the Int32 type    Here there is a longer explanation

User · Answer

Convert ToInt32 myValue     Though I don t know what it will do when it s greater than int MaxValue

User · Answer

A possible way is to use the modulo operator to only let the values stay in the int32 range  and then cast it to int   var intValue   int  longValue   Int32 MaxValue

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Wouldn t   int  Math Min Int32 MaxValue  longValue    be the correct way  mathematically speaking

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Sometimes you re not actually interested in the actual value  but in its usage as checksum hashcode  In this case  the built-in method GetHashCode   is a good choice   int checkSumAsInt32   checkSumAsIn64 GetHashCode

User · Answer

Just do  int myLongValue  It ll do exactly what you want  discarding MSBs and taking LSBs  in unchecked context  which is the compiler default   It ll throw OverflowException in checked context if the value doesn t fit in an int   int myIntValue   unchecked  int myLongValue

[c#] Can I convert long to int?

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