CS 111 - Program Design I

Exam 2 Solutions

1. A
2. B
3. B
4. D
5. C
6. D
7. C
8. A
9. B
10. A
11. C
12. B
13. A
14. D
15. A
16. D
17. B
18. A
19. B
20. C
21. 
    public static Picture q21 ( Picture p )
    {
    int width = p.getWidth();
    int height = p.getHeight();
    
    int Xindex;
    int Yindex;
    
    for ( Xindex = 0 ; Xindex < width ; Xindex = Xindex + 1 )
    {
    for ( Yindex = 0 ; Yindex < height ; Yindex = Yindex + 1 )
    {
    Pixel pix = p.getPixel(Xindex, Yindex);
    
    int red = pix.getRed();
    int green = pix.getGreen();
    int blue = pix.getBlue();
    
    int brightness = (int)(red*0.299 + green*0.587 + blue*0.114) ;
    
    if ( brightness < 51 )
    {
    pix.setColor (Color.MAGENTA);
    }
    else if ( brightness < 102 )
    {
    pix.setColor (Color.RED);
    }
    else if ( brightness < 153 )
    {
    pix.setColor (Color.ORANGE);
    } else if ( brightness < 204 )
    {
    pix.setColor (Color.YELLOW);
    }
    else
    {
    pix.setColor (Color.PINK);
    }
    }
    }
    return p;
    }
22. 
    public static Picture q22( Picture p )
    {
    int width = p.getWidth();
    int height = p.getHeight();
    Picture pic2 = new Picture (width, height*3);
    
    int Xindex;
    int Yindex;
    
    for ( Xindex = 0 ; Xindex < width ; Xindex = Xindex + 1 )
    {
    for ( Yindex = 0 ; Yindex < height ; Yindex = Yindex + 1 )
    {
    // access my original/from pixel
    Pixel pix1 = p.getPixel(Xindex, Yindex);
    Color c1 = pix1.getColor();
    
    // access my to pixel
    int modifiedX = Xindex;
    int modifiedY = Yindex;
    Pixel pix4 = pic2.getPixel(modifiedX, modifiedY);
    pix4.setColor (c1);
    
    // access my to pixel
    modifiedX = Xindex;
    modifiedY = Yindex + (1 * height);
    pix4 = pic2.getPixel(modifiedX, modifiedY);
    pix4.setColor (c1);
    
    // access my to pixel
    modifiedX = Xindex;
    modifiedY = Yindex + (2 * height);
    pix4 = pic2.getPixel(modifiedX, modifiedY);
    pix4.setColor (c1);
    }
    }
    
    return pic2;
    }