#import <objc/objc.h>
#import <objc/Object.h>
#import <stdio.h>

@interface Rectangle: Object 
{
    int width;
    int height;
}

-(Rectangle*) initWithWidth: (int) w height: (int) h;
-(void) setWidth: (int) w;
-(void) setHeight: (int) h;
-(void) setWidth: (int) w height: (int) h;
-(int) width;
-(int) height;
-(void) print;
@end

////////////////////////////////////////////////////////

@implementation Rectangle
-(Rectangle*) initWithWidth: (int) w height: (int) h 
{
    self = [super init];

    if ( self ) 
	{
        [self setWidth: w height: h];
    }

    return self;
}

-(void) setWidth: (int) w 
{
    width = w;
}

-(void) setHeight: (int) h 
{
    height = h;
}

-(void) setWidth: (int) w height: (int) h 
{
    width = w;
    height = h;
}

-(int) width 
{
    return width;
}

-(int) height 
{
    return  height;
}

-(void) print 
{
    printf( "width = %i, height = %i", width, height );
}
@end

@interface Square: Rectangle
-(Square*) initWithSize: (int) s;
-(void) setSize: (int) s;
-(int) size;
@end

////////////////////////////////////////////////////////

@implementation Square
-(Square*) initWithSize: (int) s 
{
    self = [super init];

    if ( self ) 
	{
        [self setSize: s];
    }

    return self;
}

-(void) setSize: (int) s 
{
    width = s;
    height = s;
}

-(int) size 
{
    return width;
}

-(void) setWidth: (int) w 
{
    [self setSize: w];
}

-(void) setHeight: (int) h 
{
    [self setSize: h];
}
@end

////////////////////////////////////////////////////////

int main(int argc, const char *argv[]) 
{
    Rectangle *rec = [[Rectangle alloc] initWithWidth: 10 height: 20];
    Square *sq = [[Square alloc] initWithSize: 15];

    // print em
    printf( "Rectangle: " );
    [rec print];
    printf( "\n" );

    printf( "Square: " );
    [sq print];
    printf( "\n" );

    // update square
    [sq setWidth: 20];
    printf( "Square after change: " );
    [sq print];
    printf( "\n" );

    // free memory
    [rec release];
    [sq release];
    
    return 0;
}