Limits.h

"limits.h" is the header of the general purpose standard library of the C programming language which includes definitions of the characteristics of common variable types. The values are implementation specific, but may not be of lower magnitude than certain specified values in a conforming C implementation.

Member constants

The "minimum-magnitude value" column is the minimum possible magnitude for this constant as specified by the standard. In particular, _MIN values represent the minimum magnitude representable in the rarely-used one's complement and sign-magnitude forms. Most implementations will have larger magnitudes for at least some of these numbers. For instance:
* Two's complement implementations have SCHAR_MIN equal to –128 (and similarly for all other _MIN values).
* 32-bit implementations will set INT_MAX equal to +2,147,483,647 (and likewise for INT_MIN and UINT_MAX)
* Unicode-supporting implementations will set MB_LEN_MAX to 4 or more.
* Many DSPs have CHAR_BIT equal to 16 or more [http://www.parashift.com/c++-faq-lite/intrinsic-types.html#faq-26.4] [http://home.att.net/~jackklein/c/inttypes.html#char] .

ee also

* C standard library
* Float.h - Limits on floating-point numbers

External links

* [http://www.cwi.nl/~steven/enquire.html Enquire] : A program for automatically generating limits.h, and for checking that the values in an existing limits.h are correct

References

* [http://www.acm.uiuc.edu/webmonkeys/book/c_guide/2.5.html C Guide--2.5 limits.h] , accessed in September 2006.