#include <stdio.h>

#if 0
int fun(int *p) 
{ 
  int n=10;
  int *q = &n; // char to pointer is different
  p = q;  // pointer to pointer so the q value can be copied
  printf("%d",*p); // the pointer value cannot be passed to the main

/*
  int q = 10; 
  p = q;  // pointer to integer so p cannot take q value
  printf("%d",*p);
 */
}     
    
int main() 
{ 
  int r = 20; 
  int *p = &r; 
  fun(p); 
  printf("%d", *p); 
  return 0; 
}
#endif

void fun(int **pptr)
{
  static int q = 10;// or no static its ok
  *pptr = &q;
}

int main()
{
  int r = 20;
  int *p = &r;
  fun(&p);
  printf("%d", *p);
  return 0;
}