// test malloc() and free()
//
#include <stdio.h>
#include <stdlib.h>

int main( void)
{
  size_t n = 0; char *p, *q = NULL;

  printf( "Enter list of sizes:\n");

  while( scanf("%zi",&n) == 1)
  {
    p = q;
    q = malloc(n); // intentionally allocating new space before freeing old
    free(p);
    printf( "%zi bytes at %p\n", n, (void *) q );
  }

  return 0;
}

/* sample run:

Enter list of sizes:
20
20 bytes at 0x55c6fc852a80
20
20 bytes at 0x55c6fc852aa0
10
10 bytes at 0x55c6fc852a80

*/