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

Another alternative is something like this:

#ifdef SOME_OS
  #define COPY_STR "copy %s %s"  // some sort of OS-specific syntax

#elif defined SOME_OTHER_OS
  #define COPY_STR "%s cpy %s"   // some sort of OS-specific syntax

#else
  #error "error text"
#endif

...

#include    //sprintf()
#include   //system()

char copy_str[LARGE_ENOUGH];
char* source;
char* dest;
...

sprintf (copy_str, COPY_STR, source, dest);
system (copy_str);