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# "Style" comments for Homework 3
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(1) Become familiar with the Fortran built-in (intrinsic) 
    functions.  See Appendix A of the SGI Fortran 77 
    Language Reference Manual available on-line via the 
    Course Resources page.  Note in particular that

    exp()

    is built-in.

(2) Specify all real*8 constants to FULL real*8 precision. 
    As a general rule, this means 16 significant digits.

(3) DO NOT clutter standard output with non-machine-readable
    junk, i.e. use 

         write(*,*) value

    rather than 

         write(*,*) 'The value is ', value

    REMEMBER THE "UNIX PHILOSOPHY"---it should be as easy as 
    possible to pipe the output of one program into the input 
    of another

(4) DO NOT clutter standard error with frivolous error messages
    such as 

          write(0,*) 'OK, we are done ...'

    TAKE YOUR PROGRAMMING SERIOUSLY

(5) Minimize use of division (SLOW compared to multiply).
    E.g. Use 

          ahalf = 0.5d0 * a

    rather than

          ahalf = a / 2.0d0

    and NEVER use 

          ahalf = a / 2