Is u_int64_t available on 32-bit machine?

Question

I want to use a u_int64_t variable as search key,

is u_int64_t available on 32-bit machine?

if not, I have to divide this variable into two varibles? then as a search key, it is a bit more troublesome

are there any workaround for this?

Answer 1

An unsigned 64-bit integral type is not guaranteed by the C standard, but is typically available on 32-bit machines, and on virtually all machines running Linux. When present, the type will be named uint64_t (note one less underscore) and declared in the <stdint.h> header file.

Answer 2

Yes 64 bit integer datatype is supported on a 32 bit machine.

In C89 Standard , long long (≥ 64, ≥ size of long) type is supported as a GNU extension. In C99 standard, there is native support for long long(≥ 64, ≥ size of long) integer.