If the rational number mode is selected (
), or OPTION ARITHMETIC RATIONAL is written in a program unit, calculation becomes rational.
Rational numbers are outputted as a form of a improper fraction, but this form cannot be used for inputs or datum.
Rational numbers can be outputted as a decimal fraction by use of PRINT USING, whereas PRINT USING can deal at most 1000 digits.
The base for a power operation is limited to an integer of -2147483647 to 2147483647.
Any irrational functions such as SQR and trigonometric, exponential，or logarithmic functions are not available.
<Remarks>
Line breaks may be inserted in a numerals written to the text window at every about 3000 digit. This is due to a specification of MS-Windows. To avoid this, write to a file.
Ref. Overview of Files