**fig1_9.txt**

/* 1*/	// Some include files: only <iostream.h> is actually needed.
/* 2*/	#include <iostream.h>
/* 3*/	#include <stdlib.h>
/* 4*/	#include <math.h>

/* 5*/	main( )
/* 6*/	{
/* 7*/	    Complex C1( 6.0, 4.0 ), C2( 8.0, 2.0 );
/* 8*/	    Complex C3( 1.0, 1.0 ), C4( 3.0, 2.0 ), C5;

/* 9*/	    C5 = -( C1 * C2 ) / ( C3 * C4 );
/*10*/	    cout << C5 << endl;

/*11*/	    C5 += 3;
/*12*/	    cout << C5 << endl;

/*13*/	    C5 += Complex( 2, 5 );	// 2 + 5i is added to C5.
/*14*/	    cout << C5 << endl;

/*15*/	    C5 += C1 += C2;		// C1 is adjusted by C2; C5 by new C1.
/*16*/	    cout << C1 << endl << C5 << endl;

/*17*/	    C5 += ( 2, 5 );		// This produces an unintended result.
/*18*/	    cout << C5 << endl;

/*19*/	    return 0;
/*20*/	}