Using the pseudo code

It is recommended that all programmers use the same conventions for the pseudo code. For a mathematical description of the algorithm, the algorithm needs to be written exactly as it would appear in an article. Use superscripts and subscripts for upper and lower indices respectively.


Provide clear translations for unavailable symbols, for example sqrt (square root) or sum (sum).


The structures used are those resembling a structural diagram, except that indentations are used instead of lines. An alternative is Jackson Structured Programming (JSP), but its readability is slightly less than that of a structural diagram.
The three control structures result in:

• sequence
  Statements are described one below the other.
• selection
  • IF - THEN - ELSE:

                     if ... then
                        statements
                     else
                        statements
    

  • SELECT - CASE:

                     select ...
                       case ..
                         statements
                       case ..
                         statements
                       ...
                       else
                         statements
    

• iteration
  The three allowed structures are written as follows:
  • DO ENDDO

                         for i = i1 (i2) i3
                            statements
    

  • DO WHILE

                         while ...
                            statements
    

  • REPEAT UNTIL

                         repeat until ...
                            statements