The bits for 32-Bit floating point values are divided up like this: 23 bit for the mantissa, 8 bits for the exponent. Floating point values represent a single-precision 32-bit IEEE 754 value. The type has an accuracy of about seven digits.
A detailed description of the floating point type can be found for instance in WikiPedia at http://en.wikipedia.org/wiki/Floating_point in english or at http://de.wikipedia.org/wiki/Gleitkommazahl in german.

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