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

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

  if ( NULL != x )
  {
    *x = 1;

    //......

    free ( x );  //违背1
  }
  else
  {
    return ( -1 );
  }

  //......

  return ( 0 );
}