Numeric Literals
Numeric literals are written as a sequence of digits from 0
to 9
. Initial zeros are ignored. A sign can always precede the digits, but it is optional for positive numbers. In decimal numbers, the integer part and the decimal part are divided with a dot (.
).
If the integer part is zero, it can be omitted, but the literal must begin with a dot.
The notation with exponent can be used. The exponent is preceded by an E
or e
character. The exponent can be preceded by a sign and must be an integer. A number N
with an exponent part X
, is calculated as N * POW(10, X)
.
In some cases, adding zeroes at the end of a decimal number can increment the precision of the expression where the number is used. For example, PI()
by default returns a number with 6 decimal digits. But the PI()+0.0000000000
expression (with 10 zeroes) returns a number with 10 decimal digits.
Hexadecimal literals are interpreted as numbers when used in numeric contexts.
Examples
10 +10 -10
All these literals are equivalent:
0.1 .1 +0.1 +.1
With exponents:
0.2E3 -- 0.2 * POW(10, 3) = 200 .2e3 .2e+2 1.1e-10 -- 0.00000000011 -1.1e10 -- -11000000000