CS 101 - 10/11/11

Project 2:

Start with 2 pictures

Picture 1 => black&red
Picture 2 => black&cyan (green/blue)

Final picture => combine the black&red picture
                   with the black&cyan picture 


Picture 1 => red color value for a pixel
Picture 2 => green/blue color value for a pixel

   key: each pixel has 3 color values (red, green, blue)
          
         in the final picture: 
              red value comes from picture 1
              green/blue values come from picture 2

-----------------------------------

Assignment statements

Looping statements (while, for, do-while)

Methods

If statements

     Selection Statement - does a section of code
         get executed or not

   If then form of the if statement

     if ( <condition> )
        {
          <statements> ;
        }

  Example:  Absolute value    |-3x|   

      int x;
      x = SimpleInput.getIntNumber("Enter a value");

      if ( x < 0 )
         {
           x = -x;   
         }

     SimpleOutput.showInformation ("The absolute value is:  " + x);

-----------------------

   If then else form / If else form of the if statement

    
    if ( <condition> )
      {
        <statements1> ;
      }
    else
      {
        <statements2> ;
      }

    if the <condition> is true,
          <statements1> is executed;
    otherwise, 
          <statements2> is  executed;


    Example: finding the larger of two numbers

    int x;
    int y;
    int max;

    if ( x < y )
       {
         max = y;
       }
    else
       {  
         max = x;
       }

    SimpleOutput.showInformation 
       ("The larger value is: " + max);

----------------------------------

   Posterization
      - a technique ussed to reduce the number of
          colors to a set amount.

      4 color posterization

          white, green, blue, black


-----------------------------------

Boolean Operators
    - combine multiple boolean expressions

    and:  && 
    or:   ||
    not:   !

   And: if both operands are true, the result is true;
            otherwise the result is false

   Or: if either operand is true, the result is true;
            otherwise the result is false

   Not: if the operand is false, the result is true;
            otherwise the result if false


Truth Table:

         op1   op2  |  op1 && op2   | op1 || op2
         ===========|===============|============ 
          T     T   |       T       |      T
          T     F   |       F       |      T
          F     T   |       F       |      T
          F     F   |       F       |      F


          op   |   !op
          =====|=======
           T   |    F
           F   |    T