// Text can be any number of lines.
// Last line of an item starts with a :  and may specify a figure file.
// Elaborations are enclosed in braces.

<h2>Please evaluate the assignment expression.</h2>
: 
{
   
   <h2>Evaluate the assignment expression one step (operator) at a time.</h2>
   : 
   {
      <h3>At each step, identify the operator that is evaluated next by
      clicking and dragging the mouse.</h3> 
      : 
      {
         Click and drag the mouse to cover the operator and its operand(s).
         : clickdrag.GIF
             
         If you do not cover all the operands, your answer will be marked incorrect. 
         : incorrect.GIF
      }
   
      <h3> Enter the value returned by the sub-expression, in the box that pops up.</h3>
      : 
      {
         First, verify the sub-expression.<BR>
	 If it is not the one you selected, you did not cover all the
	 operands when you dragged the mouse.<BR>
	 Click on <it>Cancel</it> button, and return to clicking/dragging the mouse again.
         : incorrect2.GIF

	 If the sub-expression is what you selected, enter the result and click <it>OK</it>.
         : intermediate.GIF
   
	 Follow the instructions for entering the result in the correct format.
	 These same instructions will be displayed every time.
         : instructions.GIF
      }


      <h3> Enter any changes in the values of variables in the sub-expression,
	in the second box that pops up.</h3>
      :
      {
         If no variable's value changed in the sub-expression,
              click on <it>No Changes</it>
	 : nochanges.gif


         Otherwise, enter <b>only</b> the values that changed
             and click on <it>Submit Changes</it>
         : submitchanges.gif
      }

      <h3>Your answer <B>may be</B> color-coded. If it is marked in <GR>green</GR>, it is correct. If it is marked in <RD>red</RD>, it is incorrect</h3>
      : correctIncorrect.GIF

      <h2>You can undo one or all previous steps.</h2>
      :
      {
         Click on Edit menu and select <it>Undo last entry</it> or <it>Clear entire answer</it>.
         : edit.GIF

	 On Windows, you can also click on the right mouse button and select <it>Undo last step</it> or <it>Clear all steps</it>.
         : undo.GIF
       }
   }
   
   <h2>After evaluating all the steps, click on the <it>Submit Answer</it> button.</h2>
   : submit.GIF
}