Is it possible to store 2 32-bit values in one long int variable?

Question

I want to store two 32-bit values in a single long int variable.

How would you do this on a 32-bit OS using C? Is it possible to store the data in a single long long variable? If so, how is that done?

Answer 1

Use an uint64_t and bitwise operators.

uint64_t i64;
uint32_t a32, b32;

// Be carefull when shifting the a32.
// It must be converted to a 64 bit value or you will loose the bits
// during the shift. 
i64 = ((uint64_t)a32 << 32) | b32;