unsigned in with mpif90

[anton_helm]

Hey,

I'm using mpif90 (inter-compiler and mpi) for compiling a FORTRAN
code. I just wanted to add some new unsigned integers, but I can't get
an unsigned integer with my compiler. Or does anybody have a solution
for my problem?
I just want an 64bit integer with the values from 0 up to 2**64 - 1.

Is there a function which give me the max value of my defined variable?

Thanks.

Best regards
Anton