A real number, i.e. 1, -25, 6.52, 1805.6352
Numbers are stored as single precision floating point numbers, which allow for a large range of values with limited precision (generally accurate to 6 or 7 decimal places). The number data type is also sometimes referred to as "scalar" (for example, returned by the supportInfo script command).
The largest real positive number that can be entered via script is: 3.4028235e38
The largest real negative number that can be entered via script is: -3.4028235e38
Larger numbers: In scripts it is possible to generate a representation of an infinite positive or negative number which compares even larger or smaller than the above two floating point limits;
Positive infinity 1e39 = "1.#INF"
Negative infinity -1e39 = "-1.#INF"
Indeterminate (NaN) = "-1.#IND"
The finite command can be used to verify if a number represents infinity or NaN.
A number is a sequence of characters starting either with a digit, an $ or a .. If it starts with a digit it may be an integer (e.g. 3), a floating point number (e.g. 3.2) or a hexadecimal number (see below). If it starts with a $ it is also a hexadecimal number and if it starts with a . it is a floating point number smaller than 0 (e.g. .1 = 0.1). If the number is not hexadecimal it may contain exactly one period and ends before the first non-digit character (except that one period of course). The only exception from that is the scientific notation.
The scientific notation in SQF has the syntax
That means it consists of a pre-factor that can be any number (integer or floating point). Then a e or E followed by an optional sign (+ or -) and at the end an integer (a whole number). This will then be interpreted in the following way
aEb = a * 10^b
1e2 = 1E2 = 100
5e-2 = 5E-2 = 0.05
1.234e4 = 1.234E4 = 12340
If omitted the exponent b will be considered to be zero and therefore
aE = a
Although the result is being calculated the engine will issue an error on that becasue the exponent is not optional! If the pre-factor a is omitted it is no longer a number as it doesn't start with a digit or a period. If one tries to use a hexadecimal number as the pre-factor the e will simply be interpreted as part of that hexadecimal number and therefore it is no longer a scientific notation.
Essentially numbers in SQF are in the format the atof function in C(++) expects numbers to be (See http://www.cplusplus.com/reference/cstdlib/atof/) with the exception that hexadecimals can also start with a $ as well.
Arma supports hexadecimal numbers in both scripts and configs. Most common notation for hex numbers is 0x followed by the hexadecimal value. Alternatively symbol $ can be used for the same thing. It is also possible to mix and match notations:
0xFF = 0xff
It's special properties are that it will always supply a value from 0 to 360
Scripting vs Addons
Integers and Floats
Note also, unlike config.cpp's, Boolean is a real type in scripting language. In addons, it is a poetic licence for a zero/non zero Integer. In Arma 3 command parseNumber has been extended to accept booleans: