Serialize double and float with C

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The portable way: use frexp to serialize (convert to integer mantissa and exponent) and ldexp to deserialize.

The simple way: assume in 2010 any machine you care about uses IEEE float, declare a union with a float element and a uint32_t element, and use your integer serialization code to serialize the float.

The binary-file-haters way: serialize everything as text, floats included. Use the "%a" printf format specifier to get a hex float, which is always expressed exactly (provided you don’t limit the precision with something like "%.4a") and not subject to rounding errors. You can read these back with strtod or any of the scanf family of functions.

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