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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 DEBIAN

bit::vector::minimal

Bit::Vector::Minimal(3pm)				User Contributed Perl Documentation				 Bit::Vector::Minimal(3pm)

NAME

       Bit::Vector::Minimal - Object-oriented wrapper around vec()

SYNOPSIS

	 use Bit::Vector::Minimal;
	 my $vec = Bit::Vector->new(size => 8, width => 1, endianness => "little");
	 # These are the defaults

	 $vec->set(1); # $vec's internal vector now looks like "00000010"
	 $vec->get(3); # 0

DESCRIPTION

       This is a much simplified, lightweight version of Bit::Vector, and wraps Perl's (sometimes confusing) "vec" function in an object-oriented
       abstraction.

METHODS

   new
       Creates a new bit vector. By default, this creates a one-byte vector with 8 one-bit "slots", with bit zero on the right of the bit pattern.
       These settings can be changed by passing parameters to the constructor: "size" will alter the size in bits of the vector; "width" will
       alter the width of the slots. The module will die if "width" is not an integer divisor of "size". "endianness" controls whether the zeroth
       place is on the right or the left of the bit vector.

   set(POS[, VALUE])
       Sets the bit or slot at position "POS" to value "VALUE" or "all bits on" if "VALUE" is not given.

   get(POS)
       Returns the bit or slot at position "POS".

   display
       Display the vector. For debugging purposes.

AUTHOR

       Current maintainer: Tony Bowden

       Original author: Simon Cozens

BUGS and QUERIES
       Please direct all correspondence regarding this module to:
	 bug-Bit-Vector-Minimal@rt.cpan.org

SEE ALSO

       Bit::Vector

COPYRIGHT AND LICENSE

       Copyright 2003, 2004 by Kasei

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.12.3							    2005-10-04						 Bit::Vector::Minimal(3pm)
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