Segmentation Fault ERROR in C Post: 302958045

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Top Forums Programming Segmentation Fault ERROR in C Post 302958045 by DinisR on Sunday 18th of October 2015 07:27:22 PM

10-18-2015

Registered User

Segmentation Fault ERROR in C

Hello guys, i have this code:

Code:

int main(int argc, char *argv[]) {
  int i, j, N, result = 0, **vec;

  if (argc < 2) {
    fprintf(stderr, "Usage: %s N\n", argv[0]);

  }

  /* ... how many numbers to read */
  N = atoi(argv[1]);
  /* check if N is a power of two; exit if not */
  if (! check(N)) {
    fprintf(stderr, "%d is not a power of 2 as required.  Exiting.\n", N);
    exit(1);
  }

  vec = (int**)malloc( (N)*(N)*sizeof(int*) );
  if ( vec == NULL ) {
    fprintf (stderr, "ERROR: not enough memory available!\n");
    exit ( 2 );
  }

  for (i = 0; i < N; i++)
    for (j = 0; j < N; j++)
      scanf("%d", &vec[i][j]);

  printf("\nOriginal array:\n ");
  for (i = 0; i < N; i++) {
    for (j = 0; j < N; j++)
      printf("%d ", vec[i][j]);
    printf("\n");
  }

  /* Now process array; example below is to add numbers */
  for (i = 0; i < N; i++) {
    result = check_property(vec[i], 0, N-1);
    printf("result[line %d]: %d\n", i, result);
  }

  /* free memory */
  free(vec);

  exit(0);

Basically i have to run it has eg. ./program N
my N needs to be a power of 2, like 4 or 8, 16 etc...
when i run it, it goes to the part of scanf and then if i write a number or file name, it gives me a segmentation fault error. Any ideas why?
I dont know if it is because of the memory allocation...

(There are functions there which i have defined but not illustrated, because they are not the problem i think)

Last edited by DinisR; 10-18-2015 at 08:43 PM..

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LEARN ABOUT DEBIAN

pgacreate

PGACreate(8)							      PGAPack							      PGACreate(8)

NAME

       PGACreate - creates an uninitialized context variable.  The Fortran version of this function call contains only the last three arguments

INPUT PARAMETERS

       argc   - address of the count of the number of command line arguments.
       argv   - array of command line arguments.
       datatype
	      -  the  data  type  used	for  the  strings.   Must  be  one  of	PGA_DATATYPE_BINARY, PGA_DATATYPE_CHARACTER, PGA_DATATYPE_INTEGER,
	      PGA_DATATYPE_REAL, or PGA_DATATYPE_USER
       binary -valued, character-valued, integer-valued,
       real   -valued, or a user-defined datatype, respectively.
       len    - the string length (number of genes).
       maxormin
	      - the direction of optimization. Must be one of PGA_MAXIMIZE or PGA_MINIMIZE for maximization or minimization, respectively.

OUTPUT PARAMETERS

       none

SYNOPSIS

       #include "pgapack.h"
       PGAContext * PGACreate(argc, argv, datatype, len, maxormin)
       int *argc
       char **argv
       int datatype
       int len
       int maxormin

LOCATION

       create.c

EXAMPLE

       Example:

       In C:
       void main(int argc, char **argv) {
       PGAContext *ctx;
       :
       ctx = PGACreate(&argc, argv, PGA_DATATYPE_BINARY, 100, PGA_MAXIMIZE);
       :
       //  Set options here
       :
       PGASetUp(ctx);
       :
       //  Run the GA here
       :
       PGADestroy(ctx);
       }

       In FORTRAN:
       integer ctx
       :
       ctx = PGACreate(PGA_DATATYPE_BINARY, 100, PGA_MAXIMIZE)
       :
       c       Set options here
       :
       call PGASetUp(ctx)
       :
       c       Run the GA here
       :
       call PGADestroy(ctx)
       stop
       end

								     05/01/95							      PGACreate(8)

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