Overflow errors (extype1002, extype1003)

Full BASIC has bounds in numerical values.
The largest number that can be operated in the decimal mode of Decimal BASIC is 10⁹⁹.
Numerical calculation must be planned so that operation results shall not exceed that value on the way.
Furthermore, Full BASIC has the smallest positeve number. Any posite numbers smaller than that shoud be rounded to zero. The smallest positive number in the decimal mode of Decimal BASIC is 10^-99.
Supplement
On the binary mode , The largest number is approximately 1.8×10³⁰⁸, and the smallest positive number is approximately 4.9×10^-324.
On the decimal 1000-digit mode , the largest number is 10¹⁰⁰⁸, and the smallest positive number is 10^-1017.
The rational operation mode has no such bounds with numerical values.

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