How can I copy a file from one directory to another in c/c++

Question

I am looking for a simple example on how to copy a file from one directory to another in C. The program should only use cross platform functions that are native to C.

Answer 1

open source file read-only
create destination file for write
while there's still data in source file
    read data from source file
    write it to destination file
close both files

I'm sure you can do it!