Java Glossary : IEEE 754 Floating Point

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IEEE 754 Floating Point: the internal binary format used for floating point and double numbers. The format assigns a meaning to every possible combination of bits. There are also representation for NAN (Not A Number) and plus and minus infinity.
A double is 8 bytes, 64 bits,
With 14 to 15 significant digits of accuracy.
covers a range from ±4.94065645841246544e-324d to ±1.79769313486231570e+308d,
is formed of 3 fields:
1-bit sign
11-bit base 2 exponent biased+1023
52-bit fraction, lead 1 implied
e.g. 3. = 0x4008000000000000
-3. = 0xC008000000000000
A float is 4 bytes, 32 bits,
With 6 to 7 significant digits of accuracy.
covers a range from ±1.40129846432481707e-45 to ±3.40282346638528860e+38,
is formed of 3 fields:
1-bit sign
8-bit base 2 exponent biased+127
23-bit fraction, lead 1 implied
e.g. 3. = 0x404000
-3. = 0xC04000
primitives

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