What is the difference between "double" and "float"?

Answer 1

" In most modern architectures, a float is 4 bytes, a double is 8, and a long double can be equivalent to a double (8 bytes), or 16 bytes.
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Sources:

https://www.sololearn.com/learn/CPlusPlus/1622/?ref=app
https://www.sololearn.com/learn/1345/?ref=app

"Difference between float and double in C/C++"

https://www.geeksforgeeks.org/difference-float-double-c-cpp/

Answer 2

A small correction. On x86-64, the size of long double is 10 bytes (because that's how much the processor can handle). In ARM64 it's 8 byes.

Answer 3

double alocate 2x more number info than float. so if a float uses 8bits,double use 16. if you don't have a small circuit with memory limitations, you can use double without any fear.