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Full Discussion: Segmentation Fault ERROR in C
Top Forums Programming Segmentation Fault ERROR in C Post 302958137 by DinisR on Monday 19th of October 2015 07:52:49 PM
Old 10-19-2015
Thank you for your answer!

Here are my functions which weren't illustrated.

check_property

Code:
int check_property(int *vec, int iL, int iR) {
  int k, res, resl, resr;
  int iM = (iR - iL) / 2;

  if (iM == 0) {
    if (vec[iL] != vec[iR]) return(0);
    else return(1);
  }
  for (res = 1, k = 0; k < (iR-iL); k++) {
    if (vec[iL + k] != vec[iL + k + 1]) {
      res = 0;
      break;
    }
  }
  resl = check_property(vec, iL, iL + iM);
  resr = check_property(vec, iL + iM+1, iR);
  return(res+min(resl,resr));
}

check

Code:
int check(int N) {
  int K = 1;

  while (K < N) {
    K = K * 2;
    if (K == N)
      return(1);
  }
  return(0);
}

min

Code:
int min(int a, int b) {
  if (a < b) return (a);
  else return(b);
}

But i agree with your code, and it works, the s() functions works fine on
&vec[s(N, i, j)]

But i still cant understand why it doesnt works with just
&vec[i][j]

You say:
Quote:
the compiler has never been told the dimensions of that array. So, that can't work.
By inc the i an j, I'm giving the dimension of the array until it reaches its max which is N^2 or am I incorrect?

Is there a way to do it without using the s() function?


POST EDIT:

I have done a new solution, i came up with this on the memory allocation:

Code:
/* allocate memory, read in the array and print it */
  vec = (int**)malloc(N*sizeof(int*));
  if ( vec == NULL ) {
    fprintf (stderr, "ERROR: not enough memory available!\n");
    exit ( 2 );
  }
/*New allocation*/
  for (j=0; j<N; j++){
    vec[j]= (int*)malloc(N*sizeof(int));
      if ( vec[j] == NULL ) {
    fprintf (stderr, "ERROR: not enough memory available!\n");
    exit ( 4 );
    }
  }

Now i understand what you were telling me about the dimensions.
I have debated this with a friend of mine and he told me there were 2 solutions to my problem; this one of the memory allocation, or yours, creating a s() function like you did

Thank you for your time!
Last edited by DinisR; 10-19-2015 at 10:43 PM..
 

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LEARN ABOUT ULTRIX

sigaction

sigaction(3)						     Library Functions Manual						      sigaction(3)

Name
       sigaction - software signal facilities (POSIX)

Syntax
       #include <signal.h>

       struct sigaction {
       void  (*sa_handler)();
       sigset_t sa_mask;
       int   sa_flags;
       };

       int sigaction(sig, vec, ovec)
       int sig;
       struct sigaction *vec, *ovec;

Description
       The sigaction call is the POSIX equivalent to the system call. This call behaves as described on the reference page with the following mod-
       ifications:

       o    The signal mask is manipulated using the functions.

       o    A process can suppress the generation of the SIGCHLD when a child stops by setting the SA_NOCLDSTOP bit in sa_flags.

       o    The SV_INTERRUPT flag is always set by the system when using in POSIX mode. The flag is set so that interrupted system calls will fail
	    with the EINTR error instead of getting restarted.

Return Values
       A  0  return value indicated that the call succeeded.  A -1 return value indicates an error occurred and errno is set to indicated the rea-
       son.

Diagnostics
       The system call fails and a new signal handler is not installed if one of the following occurs:

       [EFAULT]       Either vec or ovec points to memory which is not a valid part of the process address space.

       [EINVAL]       Sig is not a valid signal number.

       [EINVAL]       An attempt is made to ignore or supply a handler for SIGKILL or SIGSTOP.

See Also
       sigvec(2), sigsetops(3), sigprocmask(3), sigsuspend(3), sigpending(2), setjmp(3), siginterrupt(3), tty(4)

																      sigaction(3)
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