12.22.1 Types of Numeric Values
The scope of precision math for exact-value operations includes the exact-value data types (integer and
DECIMAL types) and exact-value numeric literals. Approximate-value data types and numeric literals are handled as floating-point numbers.
Exact-value numeric literals have an integer part or fractional part, or both. They may be signed. Examples:
Approximate-value numeric literals are represented in scientific notation with a mantissa and exponent. Either or both parts may be signed. Examples:
Two numbers that look similar may be treated differently. For example,
2.34 is an exact-value (fixed-point) number, whereas
2.34E0 is an approximate-value (floating-point) number.