CS 111 - 10/16/12

Still grading the exams.  Hopefully back
by Tuesday.

Combining two pictures into 1

   Blend two pictures together

     on the left side:  100% picture1, 0% picture2

     on the right side: 0% picture1, 100% picture2
===============================================

Selection Statement

    if statement

 These statements allow us to select whether or not to
   execute a sequence of statements

 Syntax:

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

   if the <condition> is true, then the <thenClause>
      is executed.
   if the <condition> is false, the <thenClause> is NOT
      executed.

  Example: absolute value    

     int number;

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

  The use of the simple if-then statement, can be used
     to verify input from the user.


  Assume we want a value to be less than 100, if not
    we print an error message and quit the program


  int number;

  number = SimpleInput.getIntNumber ("Enter a value " +
                       " less than 100");

  if ( number >= 100 )
     {
      SimpleOutput.showInformation ("Error: value is " +
                       " not less than 100");

      System.exit (-1);
     }

  // the rest of the program


Boolean Operators:  allow us to join multiple
     condition together into a single condition statement