What is the difference between int and uint long and ulong

Question

I know about int and long  32-bit and 64-bit numbers   but what are uint and ulong

User · Accepted Answer

The primitive data types prefixed with  u  are unsigned versions with the same bit sizes  Effectively  this means they cannot store negative numbers  but on the other hand they can store positive numbers twice as large as their signed counterparts  The signed counterparts do not have  u  prefixed   The limits for int  32 bit  are   int     2147483648 to 2147483647  uint  0 to 4294967295    And for long  64 bit    long  -9223372036854775808 to 9223372036854775807 ulong  0 to 18446744073709551615

User · Answer

The difference is that the uint and ulong are unsigned data types  meaning the range is different  They do not accept negative values   int range  -2 147 483 648 to 2 147 483 647 uint range  0 to 4 294 967 295  long range     9 223 372 036 854 775 808 to 9 223 372 036 854 775 807 ulong range  0 to 18 446 744 073 709 551 615

User · Answer

It s been a while since I C   d but these answers are off a bit  As far as the size goes   int  isn t anything  It s a notional value of a standard integer  assumed to be fast for purposes of things like iteration  It doesn t have a preset size  So  the answers are correct with respect to the differences between int and uint  but are incorrect when they talk about  quot how large they are quot  or what their range is  That size is undefined  or more accurately  it will change with the compiler and platform  It s never polite to discuss the size of your bits in public  When you compile a program  int does have a size  as you ve taken the abstract C C   and turned it into concrete machine code  So  TODAY  practically speaking with most common compilers  they are correct  But do not assume this  Specifically  if you re writing a 32 bit program  int will be one thing  64 bit  it can be different  and 16 bit is different  I ve gone through all three and briefly looked at 6502 shudder A brief google search shows this  https   www tutorialspoint com cprogramming c data types htm This is also good info  https   docs oracle com cd E19620-01 805-3024 lp64-1 index html use int if you really don t care how large your bits are  it can change  Use size t and ssize t if you want to know how large something is  If you re reading or writing binary data  don t use int  Use a  usually platform source dependent  specific keyword  WinSDK has plenty of good  maintainable examples of this  Other platforms do too  I ve spent a LOT of time going through code from people that  quot SMH quot  at the idea that this is all just academic pedantic  These ate the people that write unmaintainable code  Sure  it s easy to use type  int  and use it without all the extra darn typing  It s a lot of work to figure out what they really meant  and a bit mind-numbing  It s crappy coding when you mix int  use int and uint when you just want a fast integer and don t care about the range  other than signed unsigned

User · Answer

uint and ulong are the unsigned versions of int and long  That means they can t be negative  Instead they have a larger maximum value    Type    Min                           Max                           CLS-compliant int     -2 147 483 648                2 147 483 647                 Yes uint    0                             4 294 967 295                 No long       9 223 372 036 854 775 808    9 223 372 036 854 775 807     Yes ulong   0                             18 446 744 073 709 551 615    No   To write a literal unsigned int in your source code you can use the suffix u or U for example 123U   You should not use uint and ulong in your public interface if you wish to be CLS-Compliant   Read the documentation for more information    int uint long ulong   By the way  there is also short and ushort and byte and sbyte

User · Answer

u means unsigned  so ulong is a large number without sign  You can store a bigger value in ulong than long  but no negative numbers allowed   A long value is stored in 64-bit with its first digit to show if it s a positive negative number  while ulong is also 64-bit  with all 64 bit to store the number  so the maximum of ulong is 2 64 -1  while long is 2 63 -1

[c#] What is the difference between “int” and “uint” / “long” and “ulong”?

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