How to store a 64 bit integer in two 32 bit integers and convert back again

Question

I\'m pretty sure its just a matter of some bitwise operations, I\'m just not entirely sure of exactly what I should be doing, and all searches return back \"64 bit vs 32 bit

Answer 1

Or this, if you're not interested in what the two 32-bits numbers mean:

u32 x[2];
u64 z;
memcpy(x,&z,sizeof(z));
memcpy(&z,x,sizeof(z));