#include <stdio.h>#include <stdlib.h>#include <assert.h>#include "error.h"#include "mystdlib.h"long usedMemory = 0;void *checkedMalloc (int size){  if (size < 0)    exception ("what going on here?\n");      //printf ("size=%d\n", size);    void *temp = malloc (size);  if (!temp)  {    //printf ("%d\n", size);    printf ("used memory: %lfG\n", usedMemory*1.0/1024/1024/1024);    exception ("no memory!\n");  }    usedMemory += size;    return temp;}void checkedFree (void *p){  if (p)  {    //printf ("checked freeing\n");    free (p);  }  else    error ("try to free null pointers\n");}int checkedSystem (const char *s){  return system (s);}void *checkedRealloc (void *p, unsigned int size){  void *temp = realloc (p, size);  assert (temp);  return temp;}void memoryStatus (){  printf ("memory used = %lfG\n", usedMemory*1.0/1024/1024/1024);}