Operators

Common Arithmetic Operators

These operators should be consistent across every language.

Addition

+ operator Example:

x
result = 2 + 2
result += 1  # most languages have this too
# If your language doesn't, it'd look like this:
result = result + 1

Subtraction

- operator Example:

xxxxxxxxxx
result = 3 - 2
result -= 1  # most languages have this too
# If your language doesn't, it'd look like this:
result = result - 1

Multiplication

* operator Example:

xxxxxxxxxx
result = 3 * 2
result *= 4  # most languages have this too
# If your language doesn't, it'd look like this:
result = result * 4

Division

/ operator Example:

xxxxxxxxxx
result = 4 / 2
result /= 2  # most languages have this too
# If your language doesn't, it'd look like this:
result = result / 2

Modulo

% operator Example:

xxxxxxxxxx
--[[
Modulo, or modulus, is a special operator.  It returns the **remainder** of dividing two numbers.  For example, when you divide 4 by 2, you have nothing left over, so `4 % 2` will return 0.  But when you divide 3 by 2, two goes into 3 once, leaving 1 left over.  Therefore, `3 % 2` will return 1
]]
local result = 3 % 2
print(result)  -- will print "1"

One of modulo's main uses, is to check if something is a factor of something else. For example, if number x is evenly divisible by number y (dividing them results in a remainder of 0), then y is a factor of x. Therefore, to check if y is a factor of x, you'd simply have to check if (x % y == 0).