Yes. float.h contains constants such as:

FLT_EPSILON, DBL_EPSILON, LDBL_EPSILON this is the least magnitude non-zero value which can be represented by float, double, and long double representations.

FLT_MAX and FLT_MIN represent the extreme positive and negative numbers which can be represented for float. Similar DBL_ and LDBL_ are available.

FLT_DIG, DBL_DIG, LDBL_DIG are defined as the number of decimal digits precision.

You are asking for either the xxx_MIN or the xxx_EPSILON value.

Along these lines, here is a question wherein I posted some code which displays the internals of a 64-bit IEEE-754 floating-point number.

To be strict and grounded:

ISO/IEC 9899:TC2: (WG14/N1124m May 6, 2005):

5.2.4.2.2, Characteristics of floating types <float.h>

float.h contains many macros describing various properties of the floating types (including FLT_MIN and DBL_MIN).

The description of the requirements of the limits infloat.h is given in the standard (C90 or C99 - 5.2.4.2.2 "Characteristics of floating types").

In particular, according to the standard any implementation must support a lower-bound of at least 1E-37 for float or double. But an implementation is free to do better than that (and indicate what it does in FLT_MIN and DBL_MIN).

See this question for information on where to get a copy of the standards documents if you need one:

• Where do I find the current C or C++ standard documents?

Maybe this helps: float.h reference (it is C++, I m not sure if it applies to plain C as well)

This Draft C99 standard (PDF) notes minimum values for floating point type precision in section 5.2.4.2.2.

(Found via Wikipedia on C99.)

A useful reference here is What Every Computer Scientist Should Know About Floating-Point Arithmetic.

The nature of a floating point number — its size, precision, limits — is really defined by the hardware, rather than the programming language. A single-precision float on an x86 is the same in C, C#, Java, and any other practical programming language. (The exception is esoteric programming languages that implement odd widths of floating point number in software.)

Excerpts from the Standard draft (n1401.pdf)

                                      Annex F
                                    (normative)
                       IEC 60559 floating-point arithmetic
    F.1 Introduction
1   ... An implementation that defines _ _STDC_IEC_559_ _ shall conform to
    the specifications in this annex. ...

    F.2 Types
1   The C floating types match the IEC 60559 formats as follows:
    -- The float type matches the IEC 60559 single format.
    -- The double type matches the IEC 60559 double format.
    -- The long double type matches an IEC 60559 extended format ...

Wikipedia has an article about IEC 559 (or rather IEEE 754-1985) you might find interesting.