This table illustrates how code for echoing, printing the max, and
printing the average of a sequences of grades, terminated by -1, all
fit into the template/pattern we have given for processing an input
sequence.

notes:
+ view this in a mono-spaced (aka fixed width, aka non-proportional)
  font, e.g. courier, in a window that can display 104 columns; if you
  wish to print this, you may wish to consider landscape mode.
+ we use too-short variable names ($g$ instead of $grade$) to save space.
+ we butcher $System.out.println$ as $println$ to save space.
+ assume the following two lines start off each code segment:

    TokenReader in = new TokenReader(System.in);
    int g; // next grade to process

    For SavitchIn, use $g=SavitchIn.readInt()$


                     echo                       max                         print average          
                   +--------------------------+---------------------------+----------------------------+
set up:            | g = in.readInt();        | int m = -1; // max so far | int n = 0; // count so far |
  read first value |                          | g = in.readInt();         | int t = 0; // total so far |
  init. other vars |                          |                           | g = in.readInt();          |
                   +--------------------------+---------------------------+----------------------------+
while (not done) { | while (g != -1) {        | while (g != -1) {         | while (g != -1) {          |
                   +--------------------------+---------------------------+----------------------------+
  process current  |   println(g);            |   if (g>m) m = g;         |   n = n+1;                 |
                   |                          |                           |   t = t+g;                 |
                   +--------------------------+---------------------------+----------------------------+
  read next        |   g = in.readInt();      |   g = in.readInt();       |   g = in.readInt();        |
                   +--------------------------+---------------------------+----------------------------+
}                  | }                        | }                         | }                          |
                   +--------------------------+---------------------------+----------------------------+
finish up          |                          | if (m == -1)              | if (n==0)                  |
                   |                          |   println("no values");   |   println("no values");    |
                   |                          | else                      | else                       |
                   |                          |   println(m);             |   println(t/(double) n);   |
                   +--------------------------+---------------------------+----------------------------+