[OCLUG-devel] pointer from integer without a cast

[Christopher Smith]

Doug Jolley wrote:
> I've been playing around trying to get crypt to work.  I have a little
> test program that I'm using which I am appending to this message.  When
> I try to compile the test program I get a compiler warning that the
> assignment makes a pointer from an integer without a cast.  I actually
> think I understand the thrust of what that message is trying to tell
> me.  The problem is that I don't think I'm doing what it's complaining
> about.  My understanding is that the crypt function returns a pointer to
> charactger.  If that's the case; then, I'm assigning a pointer to a
> pointer and I don't understand the complaint.  Any ideas on what I'm
> missing?
> 
> Thanks for any input.
> 
>       ... doug
> - - - - - - - - - - - - - - - - - Test Program - - - - - - - - - - - - - - -
> #include <stdio.h>
> #include <unistd.h>
> int main() {
> char *p2epw;
> p2epw=crypt("blackjack","00");
> printf("Encrypted PW: %s\n",p2epw);
> return 0;
> }

Try this:

#define _XOPEN_SOURCE
#include <stdio.h>
#include <unistd.h>
int main() {
  char *p2epw;
  p2epw=crypt("blackjack","00");
  printf("Encrypted PW: %s\n",p2epw);
  return 0;
}

--Chris

P.S.: As a general rule, errors like that should make you think that you
don't have the right function prototype included. The trick is figuring
out why.