max value of integer

Question

In C  the integer  for 32 bit machine  is 32 bits  and it ranges from -32 768 to  32 767  In Java  the integer long  is also 32 bits  but ranges from -2 147 483 648 to  2 147 483 647   I do not understand how the range is different in Java  even though the number of bits is the same  Can someone explain this

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A 32 bit integer ranges from -2 147 483 648 to 2 147 483 647  However the fact that you are on a 32-bit machine does not mean your C compiler uses 32-bit integers

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In C range for   int32 is    2147483648 to 2147483647  See here for full ranges   unsigned short 0 to 65535 signed short    32768 to 32767 unsigned long 0 to 4294967295 signed long    2147483648 to 2147483647   There are no guarantees that an  int  will be 32 bits  if you want to use variables of a specific size  particularly when writing code that involves bit manipulations  you should use the  Standard Integer Types    In Java  The int data type is a 32-bit signed two s complement integer  It has a minimum value of -2 147 483 648 and a maximum value of 2 147 483 647  inclusive

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in standard C  you can use INT MAX as the maximum  int  value  this constant must be defined in  limits h   Similar constants are defined for other types  http   www acm uiuc edu webmonkeys book c guide 2 5 html   as stated  these constant are implementation-dependent but have a minimum value according to the minimum bits for each type  as specified in the standard

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The strict equivalent of the java int is long int in C   Edit  If int32 t is defined  then it is the equivalent in terms of precision  long int guarantee the precision of the java int  because it is guarantee to be at least 32 bits in size

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In C  the language itself does not determine the representation of certain datatypes  It can vary from machine to machine  on embedded systems the int can be 16 bit wide  though usually it is 32 bit    The only requirement is that short int  lt   int  lt   long int by size  Also  there is a recommendation that int should represent the native capacity of the processor   All types are signed  The unsigned modifier allows you to use the highest bit as part of the value  otherwise it is reserved for the sign bit    Here s a short table of the possible values for the possible data types             width                     minimum                         maximum signed    8 bit                        -128                             127 signed   16 bit                     -32  768                          32  767 signed   32 bit              -2  147  483  648                   2  147  483  647 signed   64 bit  -9  223  372  036  854  775  808       9  223  372  036  854  775  807 unsigned  8 bit                           0                             255 unsigned 16 bit                           0                          65 535 unsigned 32 bit                           0                   4 294 967 295 unsigned 64 bit                           0      18 446 744 073 709 551 615   In Java  the Java Language Specification determines the representation of the data types   The order is  byte 8 bits  short 16 bits  int 32 bits  long 64 bits  All of these types are signed  there are no unsigned versions  However  bit manipulations treat the numbers as they were unsigned  that is  handling all bits correctly    The character data type char is 16 bits wide  unsigned  and holds characters using UTF-16 encoding  however  it is possible to assign a char an arbitrary unsigned 16 bit integer that represents an invalid character codepoint             width                     minimum                         maximum  SIGNED byte      8 bit                        -128                             127 short    16 bit                     -32  768                          32  767 int      32 bit              -2  147  483  648                   2  147  483  647 long     64 bit  -9  223  372  036  854  775  808       9  223  372  036  854  775  807  UNSIGNED char     16 bit                           0                          65 535

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In C  the integer for 32 bit machine  is 32 bit and it ranges from -32768 to  32767    Wrong  32-bit signed integer in 2 s complement representation has the range -231 to 231-1 which is equal to  -2 147 483 648 to 2 147 483 647

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The C language definition specifies minimum ranges for various data types   For int  this minimum range is -32767 to 32767  meaning an int must be at least 16 bits wide   An implementation is free to provide a wider int type with a correspondingly wider range   For example  on the SLES 10 development server I work on  the range is -2147483647 to 2137483647   There are still some systems out there that use 16-bit int types  All The World Is Not A VAX x86   but there are plenty that use 32-bit int types  and maybe a few that use 64-bit     The C language was designed to run on different architectures   Java was designed to run in a virtual machine that hides those architectural differences

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That s because in C - integer on 32 bit machine doesn t mean that 32 bits are used for storing it  it may be 16 bits as well  It depends on the machine  implementation-dependent

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It is actually really simple to understand  you can even compute it with the google calculator  you have 32 bits for an int and computers are binary  therefore you can have 2 values per bit  spot   if you compute 2 32 you will get the 4 294 967 296  so if you divide this number by 2   because half of them are negative integers and the other half are positive   then you get 2 147 483 648  and this number is the biggest int that can be represented by 32 bits  although if you pay attention you will notice that 2 147 483 648 is greater than 2 147 483 647 by 1  this is because one of the numbers represents 0 which is right in the middle unfortunately 2 32 is not an odd number therefore you dont have only one number in the middle  so the possitive integers have one less cipher while the negatives get the complete half 2 147 483 648   And thats it  It depends on the machine not on the language

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The poster has their java types mixed up  in java  his C in is a short  short  16 bit    -32768 to 32767 int  32 bit    -2 147 483 648 to 2 147 483 647  http   docs oracle com javase tutorial java nutsandbolts datatypes html

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Actually the size in bits of the int  short  long  depends on the compiler implementation   E g  on my Ubuntu 64 bit I have short in 32 bits  when on another one 32bit Ubuntu version it is 16 bit

[java] max value of integer

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