/* impariamo a fare una chiamata al sistema operativo */

#include <stdio.h>
#include <math.h>

#define SUCCESSO 0
#define ROVINA -9

/*****************************************************************************/
int main(void)
{

  int i;
  i = system("ls");
  printf(" ls return status = %d\n",i);
  if(i!=0){printf(" Abort: ls failed returning %d\n",i); return ROVINA;}

  return SUCCESSO;
}