C++ writing and reading doubles from a binary file

Question

I want to perform disk I/O operations for a program that takes too much RAM. I use matrices of doubles and think writing them to disk as bytes is the fastest way (I need to

Answer 1

He may have been referring to binary representation in general, not just sizeof.

C - Serialization of the floating point numbers (floats, doubles)

The spec doesn't specify binary representation of floating point numbers at all. Most compilers follow IEEE, so a little unit testing should ensure the behavior you want if you know your target platforms.