How do I get DOUBLE MAX

Question

AFAIK  C supports just a few data types   int  float  double  char  void enum    I need to store a number that could reach into the high 10 digits   Since I m getting a low 10 digit   from      INT MAX     I suppose I need a double    lt limits h gt  doesn t have a DOUBLE MAX   I found a DBL MAX on the internet that said this is LEGACY and also appears to be C     Is double what I need   Why is there no DOUBLE MAX

User · Accepted Answer

DBL MAX is defined in  lt float h gt   Its availability in  lt limits h gt  on unix is what is marked as   LEGACY      linking to the unix standard even though you have no unix tag since that s probably where you found the  LEGACY  notation  but much of what is shown there for float h is also in the C standard back to C89

User · Answer

INT MAX is just a definition in limits h  You don t make it clear whether you need to store an integer or floating point value   If integer  and using a 64-bit compiler  use a LONG  LLONG for 32-bit

User · Answer

You get the integer limits in  lt limits h gt  or  lt climits gt   Floating point characteristics are defined in  lt float h gt  for C  In C    the preferred version is usually std  numeric limits lt double gt   max    for which you  include  lt limits gt     As to your original question  if you want a larger integer type than long  you should probably consider long long  This isn t officially included in C  98 or C  03  but is part of C99 and C  11  so all reasonably current compilers support it

User · Answer

Using double to store large integers is dubious  the largest integer that can be stored reliably in double is much smaller than DBL MAX  You should use long long  and if that s not enough  you need your own arbitrary-precision code or an existing library

User · Answer

You are looking for the float h header

User · Answer

Its in the standard float h include file  You want DBL MAX

[c] How do I get DOUBLE_MAX?

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