4. Encapsulation

Create classes for each printer type:

class LazerPrinter { /*etc.*/ };

class InkjetPrinter { /*etc.*/ };

class FaxMachine { /*etc.*/ };

void print( Printer* pr )
{
    if ( pr->type == 'L' ) {
        LazerPrinter.print( /*params*/ );

    } else if ( pr->type == 'I' ) {
        InkjetPrinter.print( /*params*/ );

    } else if ( pr->type == 'F' ) {
        FaxMachine.print( /*params*/ );
    }
}

Better!

However...

• if-else continues to control the logic in the original print( ) function and that adds to the complexity of the implementation.