2 Responses to “How does c++ compiler know what the allowed max/min values for limits on data types are?”

1. seoul 10/07/28 22:28

   

   a. it’s fixed during compiler construction time.

   b. cout

2. rwid 10/07/31 22:30

   

   There are C++ vendor constants for these. Each C++ compiler specifies the range of the basic types in the header

   The actual values are determined so as to optimize the data types for the execution environment. Therefore, they are machine architecture-driven for high-performance.

   Using limits.h, you can write a program to make use of these predefined constants as appropriate. The named constants you’ll be interested in have either a _MIN or _MAX suffix. For instance:
   SHRT_MIN Minimum value for an object of type short int
   SHRT_MAX Maximum value for an object of type short int
   USHRT_MAX Maximum value for an object of type unsigned short int
   INT_MIN Minimum value for an object of type int
   INT_MAX Maximum value for an object of type int
   UINT_MAX Maximum value for an object of type unsigned int
   LONG_MIN Minimum value for an object of type long int
   LONG_MAX Maximum value for an object of type long int
   ULONG_MAX Maximum value for an object of type unsigned long int