64 bit integers on 32 bit systems

I doubt it's safe to assume that long long can hold it.

So, if i want to pretend i'm an expert programmer for a while, how do i solve this in a portable way?

Basically i'm after the method to use here because i'm a eurofag so english programming terms are a problem, i don't know what to search google for.

I saw something on wikipedia that well written programs can compile on both 32 and 64 bit systems but how do you accomplish that?

>>17
Floats are 32-bit. doubles and long doubles are 64-bit. Easy misconception.