Numbers - Java - page 204

public public Complex subtract ( Complex other ) {

return

return subtract ( this this , other );

}

/** Subtract two Complexes
*/
public

public static static Complex subtract ( Complex c1 , Complex c2 ) {

return return new new Complex ( c1 . r - c2 . r , c1 . i - c2 . i );

}

/** Multiply this Complex times another one
*/
public

public Complex multiply ( Complex other ) {
return return multiply ( this this , other );

}

/** Multiply two Complexes
*/
public

public static static Complex multiply ( Complex c1 , Complex c2 ) {

return return new new Complex ( c1 . r * c2 . r - c1 . i * c2 . i , c1 . r * c2 . i + c1 . i * c2 . r );

}

/** Divide c1 by c2.
* @author Gisbert Selke.
*/
public public static static Complex divide ( Complex c1 , Complex c2 ) {

return return new new Complex (

( c1 . r * c2 . r + c1 . i * c2 . i )/( c2 . r * c2 . r + c2 . i * c2 . i ),
( c1 . i * c2 . r - c1 . r * c2 . i )/( c2 . r * c2 . r + c2 . i * c2 . i ));

}

/* Compare this Complex number with another
*/
public public boolean boolean equals ( Object o ) {

iif ( o . getClass () != Complex . class ) {
throw throw new new IllegalArgumentException (

"Complex.equals argument must be a Complex" );

}
Complex other = ( Complex ) o ;
return

return r == other . r && i == other . i ;

}

/* Generate a hashCode; not sure how well distributed these are.
*/
public public int int hashCode () {

return

return ( int int )( r ) | ( int int ) i ;