I don't know the full answer.
But the Fast I/O library is different or doesn't exist on the DUE.
I think you are running into problems because the compiler can't find the declarations (and functions) it needs to compile the code.
But the Fast I/O library is different or doesn't exist on the DUE.
I think you are running into problems because the compiler can't find the declarations (and functions) it needs to compile the code.