SECTION D                                              FILE INTRO.D
                                   SIMPLE EDITING

              When we get to the next section, PRIMER, you will begin to get 
          into actual programming, examining program listings and seeing how 
          they behave when run. Each part deals with a different subject. I 
          recommend that you read each part over several times and try to 
          understand the way in which the program works.
              But to derive maximum benefit from this course you need to 
          experiment a lot by changing program lines to see the effects 
          obtained.In this way you will reinforce what you have learned and 
          get a better understanding of the principles involved. Sometimes 
          there will be suggestions for changing lines, but you should also be 
          prepared to use your imagination, guided by the course, to boldly go 
          where every programmer has gone before. There are so many variations 
          on a theme in programming, that it is doubtful that even the guys 
          who wrote MALLARD BASIC know all it's nooks and crannies. Who knows; 
          you may discover a new routine, a programmer's lost chord even.
               At the risk of being boring, I would remind you again that any 
          changes that you make will only be in the computers 'memory' and 
          will not alter the program on disc unless you intend it to by 
          unprotecting the disc and deliberately 'saving' your revised program 
          to disc. Even if you make the program unworkable (unlikely) you can 
          always reload the original version from disc again. Before starting 
          a major demolition of lines, it is a good policy to LLIST the 
          relevant lines to the printer so as to see what you started out 
          with.
              At this stage you are probably muttering "Why doesn't he get on 
          with it and tell me how to alter lines then " So I will, now

          Altering program lines (Simple EDITING)
          =======================================

              All parts of a program line can be changed, including the line 
          number, but at this stage you would be well advised to leave the 
          line numbers alone and just concentrate on the remainder. 
              To change a line first ensure that you are in DIRECT mode; if 
          you have doubts just press [STOP]
              Now type 'EDIT line-number', where line-number is the number of 
          the line that you want to edit, and press [RETURN].  The line will 
          appear on screen with the cursor already on it.
              The cursor can be moved to any position on the line by using the 
          arrow keys,and any alteration can only be made at the cursor 
          position. Delete characters by using the [DEL] keys and add 
          characters by pressing the appropriate keys. Use the space bar to 
          add spaces. Most keys will repeat as long as they are held down so 
          if you hold down a [DEL] key it will carry on until all reachable 
          characters have been deleted.
              If at any time you get lost in the program you can get back to 
          the section menu by typing  GOTO 2000  .Then press [RETURN]
              Should the screen start filling up with characters or otherwise 
          misbehave, just press [STOP], then carry on.

          End of file INTRO.D
ing up with cha