CS 111 - 11/11/14

Exam 2 - Thursday, 11/13/14 during Lecture

    20 multiple choice questions
    2 write method questions
        - modifications on pictures 

    For Extra Credit toward Final Letter Grade 
         - write a potential multiple choice 
           question in the appropriate Blackboard 
           Discussion section 

Topics:

   Java - builds on information from first exam, but
     highlighting
    - for loops
    - if statements
    - Boolean Operators - AND, OR, NOT:  && || !
    - return values from methods

   Media - only questions about pictures (no turtles)
   Picture class/objects
    - creating a picture
         -from a filename
         -from width and height values
         -from another picture
    - getWidth()
    - getHeight()
    - getPixel (x, y)
    - write(), show(), explore()

   Pixel class/objects
    - getColor(), getRed(), getGreen(), getBlue()
    - setColor(), setRed(), setGreen(), setBlue()
    - colorDistance (color1, color2)

   Color class/object
    - create a Color 
        Color (redAmount, greenAmount, blueAmount)

          the range of the parameter values is from
              0 to 255

=========================
for write method questions:
   first line is very important

   public static Picture name (Picture p      )
    {
      Picture result; 
      ...

      return result;
    }

   Note: there are 2 write method questions on Picture

     and there are two basic forms of picture manipulation
        - color manipulation
        - position manipulation

==================
int i;
for (i = 1 ; i <= 100; i++)
  {
    System.out.println (i);
  }

   is the same as:

 int i;
 i = 1;
 while ( i <= 100 )
   {
     System.out.println (i);
     i++;
   }

================================

// if-then statement
if ( <cond> )
  {
    statement;
  }

// if-then-else statement
if ( <cond> )
  {
    statement1;
  }
else
  {
    statement2;
  }

// else-if clauses
if ( <cond1> )
  {
    statement1;
  }
else if ( <cond2> )
  {
    statement2;
  }
else
  {
    statement3;
  }

x = 35;
y = 0;

if ( x < 10 )
  {
    y = 1;
  }
else if ( x < 20 )
  {
    y = 2;
  }
else if ( x < 30 )
  {
    y = 3;
  }
else if ( x < 40 )
  {
    y = 4;
  }
else 
  {
    y = 5;
  }

--------------------
x = 15;
y = 0;

if ( x < 10 )
  {
    y = 1;
  }

if ( x < 20 )
  {
    y = 2;
  }

if ( x < 30 )
  {
    y = 3;
  }

if ( x < 40 )
  {
    y = 4;
  }
else 
  {
    y = 5;
  }

---------------
x = 35;
y = 0;

if ( x > 0 )
  {
    y = 1;
  }
else if ( x > 10 )
  {
    y = 2;
  }
else if ( x > 20 )
  {
    y = 3;
  }
else if ( x > 30 )
  {
    y = 4;
  }
else 
  {
    y = 5;
  }

===========================

 x  y |  x && y    x || y   !x
-------------------------------
 T  T |    T         T       F
 T  F |    F         T       F
 F  T |    F         T       T
 F  F |    F         F       T

  x = ...;
  y = ...;
  z = 0;
  if ( !(( x >= 4 ) || ( y < 7 )) ) 
      z = z + 1;
  else if ( !(( x > 4 ) && ( y <= 7 )) ) 
      z = z + 2;