Best way to ensure variable lengths stay the same across i386/x86_64?

I am trying to write code portable across 32 bit and 64 bit systems, and want to know the best, most portable way to ensure the variables stay the right length. For example, "int" is 4 bytes in 32 bit, but 8 in 64 bit. Should I declare as "long int" for 4 bytes and "long long int" for 8 bytes instead? I am not sure what the best practice is moving forward.

If you want 4 bytes use "int32_t" and if you want 8 bytes "int64_t". (MS has their own nonstandard names for these, but its similar.)

Use arrays of characters and do all of your calculations manually. ;)


Quzah.