What is the difference between int Int16 Int32 and Int64

Question

What is the difference between int  System Int16  System Int32 and System Int64 other than their sizes

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The only real difference here is the size. All of the int types here are signed integer values which have varying sizes

Int16: 2 bytes
Int32 and int: 4 bytes
Int64 : 8 bytes

There is one small difference between Int64 and the rest. On a 32 bit platform assignments to an Int64 storage location are not guaranteed to be atomic. It is guaranteed for all of the other types.

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According to Jeffrey Richter one of the contributors of  NET framework development  s book  CLR via C     int is a primitive type allowed by the C  compiler  whereas Int32 is the Framework Class Library type  available across languages that abide by CLS   In fact  int translates to Int32 during compilation   Also      In C   long maps to System Int64  but in a different programming   language  long could map to Int16 or Int32  In fact  C   CLI does   treat long as Int32       In fact  most   NET  languages won t even treat long as a keyword and won t   compile code that uses it    I have seen this author  and many standard literature on  NET preferring FCL types i e   Int32  to the language-specific primitive types i e   int   mainly on such interoperability  concerns

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EDIT  This isn t quite true for C   a tag I missed when I answered this question - if there is a more C  specific answer  please vote for that instead     They all represent integer numbers of varying sizes    However  there s a very very tiny difference    int16  int32 and int64 all have a fixed size    The size of an int depends on the architecture you are compiling for - the C spec only defines an int as larger or equal to a short though in practice it s the width of the processor you re targeting  which is probably 32bit but you should know that it might not be

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Each type of integer has a different range of storage capacity     Type      Capacity     Int16 --  -32 768 to  32 767      Int32 --  -2 147 483 648 to  2 147 483 647      Int64 --  -9 223 372 036 854 775 808 to  9 223 372 036 854 775 807    As stated by James Sutherland in his answer      int and Int32 are indeed synonymous  int will be a little more   familiar looking  Int32 makes the 32-bitness more explicit to those   reading your code  I would be inclined to use int where I just need    an integer   Int32 where the size is important  cryptographic code    structures  so future maintainers will know it s safe to enlarge an   int if appropriate  but should take care changing Int32 variables   in the same way       The resulting code will be identical  the difference is purely one of   readability or code appearance

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int  It is a primitive data type defined in C    It is mapped to Int32 of FCL type   It is a value type and represent System Int32 struct   It is signed and takes 32 bits   It has minimum -2147483648 and maximum  2147483647 value   Int16  It is a FCL type   In C   short is mapped to Int16   It is a value type and represent System Int16 struct   It is signed and takes 16 bits   It has minimum -32768 and maximum  32767 value   Int32  It is a FCL type   In C   int is mapped to Int32   It is a value type and represent System Int32 struct   It is signed and takes 32 bits   It has minimum -2147483648 and maximum  2147483647 value   Int64  It is a FCL type   In C   long is mapped to Int64   It is a value type and represent System Int64 struct   It is signed and takes 64 bits   It has minimum    9 223 372 036 854 775 808 and maximum 9 223 372 036 854 775 807 value

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They tell what size can be stored in a integer variable  To remember the size you can think in terms of  -  2 beer  2 bytes    4 beer 4 bytes  or 8 beer  8 bytes    Int16  -2 beers bytes   16 bit   2 16   65536   65536 2   -32768 to  32767  Int32  - 4 beers bytes   32 bit   2 32   4294967296   4294967296 2   -2147483648  to  2147483647  Int64  - 8 beer  bytes   64 bit   2 64    18446744073709551616   18446744073709551616  2   -9223372036854775808 to  9223372036854775807    In short you can store more than 32767 value in int16   more than 2147483647 value in int32 and more than 9223372036854775807 value in int64   To understand above calculation you can check out this video int16 vs int32 vs int64

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Int Int32   --  Original long type  Int16       --  Original int Int64       --  New data type become available after 64 bit systems   int  is only available for backward compatibility  We should be really using new int types to make our programs more precise   ---------------  One more thing I noticed along the way is there is no class named Int similar to Int16  Int32 and Int64  All the helpful functions like TryParse for integer come from Int32 TryParse

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int and int32 are one and the same  32-bit integer  int16 is short int  2 bytes or 16-bits  int64 is the long datatype  8 bytes or 64-bits

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A very important note on the 16  32 and 64 types   if you run this query    Array IndexOf new Int16   1 2 3   1   you are suppose to get zero 0  because you are asking    is 1 within the array of 1  2 or 3  if you get -1 as answer  it means 1 is not within the array of 1  2 or 3   Well check out what I found  All the following should give you 0 and not -1  I ve tested this in all framework versions 2 0  3 0  3 5  4 0   C    Array IndexOf new Int16   1 2 3   1    -1  not correct  Array IndexOf new Int32   1 2 3   1    0  correct  Array IndexOf new Int64   1 2 3   1    0  correct    VB NET   Array IndexOf new Int16   1 2 3   1    -1  not correct  Array IndexOf new Int32   1 2 3   1    0  correct  Array IndexOf new Int64   1 2 3   1    -1  not correct    So my point is  for Array IndexOf comparisons  only trust Int32

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Nothing  The sole difference between the types is their size  and  hence  the range of values they can represent

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They both are indeed synonymous  However i found the small difference between them   1 You cannot use Int32 while creatingenum   enum Test   Int32   XXX   1      gives you compilation error    enum Test   int   XXX   1      Works fine     2  Int32 comes under System declaration  if you remove using System you will get compilation error but not in case for int

[c#] What is the difference between int, Int16, Int32 and Int64?

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