Advanced C Programming
                                           Spring 2004


Exercise 6.
         
         Download the program from the web, that uses Windows API-function 
         WriteConsole and displays the character A with foreground colour 
         red and background colour white. Write six functions 
         set_fgc_intensity, clear_fgc_intensity,  get_fgc_no, set_fgc_no, 
         get_bgc_no and set_bgc_no and test them in the context of 
         downloaded program.

         Functions set_fgc_intensity and clear_fgc_intensity
         set or clear the intensity bit of foreground colour in
         the screen location indicated by it's two parameters.
         The prototype of the function set_fgc_intensity is 
		void set_fgc_intensity(int row, int column);

         This is the typical operation that consists of three phases:
	 1) Read the current value (of attribute in this case). 2) Modify
         that value as required and 3) Write the modified value back.


     Hint.
         The attribute of a given screen location can be read using 
         the Windows Console API function ReadConsoleOutputAttribute. 
         In similar way attribute can be written back so that it has
         a real effect on the screen using function 
         WriteConsoleOutputAttribute.

         Function get_fgc_no returns the colour number in the screen
         location given as a parameter. The prototype is 
               int get_fgc_no(int row, int column);
         Function set_fgc_no set the foregroung colour without modifying 
         the back ground colour.The prototype of function set_fgc_no is 
               void set_fgc_no(int row, int column, colour);                 
         
         Functions get_bgc_no and set_bgc_no are very similar to the 
         functions get_fgc_no and set_fgc_no, but they manipulate
         background colours instead of foreground colours. For example 
         the function get_bgc_no returns the background colour number
         in the creen location given as a parameter. The prototypes of 
         these functions are 
               int get_bgc_no(int row, int column);
               void set_bgc_no(int row, int column, colour);                 
         
         To test these function make the original program to work 
         as follows. Between each phase make your program to wait input,
         so that it is posible to see the effect of each function call. 

         1. Set the intensity bit of red A ON on the screen.
         2. Clear the intensity bit of A.
         3. Set it back again.
         4. Diplay the current foreground colour number and background 
             colour number
         5. Ask the user to enter a colour number and set it to the new 
			foregroung colour of A.
         6. Ask the user enter a colour number and set it to the new 
			background colour of A