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9.7.2. Numbers
An integer constant consist of an optional minus sign followed by decimal digits. Integer literals are of the C type long, 32 bit.
Numeric literals with a decimal point literal are internally of the DECIMAL SQL type, a variable length decimal floating point type. The Following are examples of decimal literals:
123.456 -16.0
Numeric literals which specify an exponent, e.g. 1.2e11 or 2e-3 are read as C doubles, (64 bit IEEE binary floating point). This is potentially less precise than the DECIMAL SQL type.
Integer literals outside of the 32-bit range are interpreted as DECIMAL.