Specifications

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Real Constants
Real constants should be formatted as shown below.
Syntax:
sign mantissa
Syntax: sign mantissa E sign exponent
Where a lowercase letter "e" is also allowed instead of uppercase letter "E."
mantissa is a numeric string composed of a maximum of 10 significant digits. It can
include a decimal point.
If included in a real constant as shown below, a comma (,) for marking every three digits
will cause a syntax error.
123,456 ’syntax error!