Comment Lines, Blank Lines, Spaces and TABs

As has already been stated, lines having the letter C in column 1 are treated as comments and are ignored. Alternatively you may also use a * instead of the letter C. Also ignored are any blank lines. Spaces and TABs(on the VMS only) can be included anywhere in the statement and are not significant except within character strings e.g. the spaces are important in 'C = '. The reader is strongly urged to use comment and blank lines and spaces freely within his or her program both to document it and to improve readability.