#include <malloc.h>
#include <stdlib.h>

int main ( void )
{
  int *x = ( int * ) malloc ( sizeof ( int ) );
  int *y = ( int * ) malloc ( sizeof ( int ) );

  if ( ( NULL != x ) || ( NULL != y ) )
  {
    *x = 1;      //遵循1
    free ( x );  //遵循2
    free ( y );  //遵循3
  }
  else
  {
    //...
  }

  return ( 0 );
}