Temporary Variables

Temporary variables are created and named via assignment statements in
the source code; the name appearing on the left side of the equal sign
is given to the file.  For example,

     acceleration = (force1 + force2)/mass;

Temporary variables should not be given the same name as an
existing file, otherwise their contents will be replaced with the values
calculated for the expression on the right side of the equals sign, and
then deleted when the algorithm is done.

This name must be unique within the current source code.  Variable
names must start with a letter and may be of any length; however, only
the first sixteen characters are significant to DAN and must therefore
not match the first sixteen characters of any other variable name.  Also,
only the first eight characters preceding a "." are significant to DOS.
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Care must be taken to use variable names that are also legal DOS file
names.  Characters in the name may be ".", any letter, or any digit. 
The "." character (if used) should only appear once and can only be
followed by 0 to 3 characters.  Upper or lower case may be used but
does not count when distinguishing names; AB,aB,Ab, and ab are all
considered to be the same name.
