# Web Turtle - Variables and Equations

Using variables is just like using normal numbers (called "constants")...

If you want to turn right 10 degrees, for example, you would write:
`RIGHT 10`

If you want to turn right "A" degrees - that is, "the number that's stored in 'A'" degrees, you would write:
`RIGHT A`

To put a number "into" the variable "A", you use the `LET` command:
`LET A 10`

Since "10" is a number, we can replace it with another variable:
`LET A B`
(This copies the number that's in "B" right now into variable "A.")

If you want to change a variable or do some math, Web Turtle supports a very simple math syntax:

`LET A 1+1`
Puts the value of (1+1), or 2, into "A."

`LET A B+1`
Puts the value of (B+1) into "A."

`LET A A+1`
Puts the value of (A+1) into "A," thus incrementing A by 1.

`LET A 10-5`
Puts the value of (10-5), or 5, into "A."

`LET A 15/5`
Puts the value of (15/5), or 3, into "A."
`LET A 12/5`
Puts the whole value of (12/5) — the whole part of 2.4, or 2 — into "A."
Note: Web Turtle currently only deals with 'integer' numbers (or 'whole' numbers).

`LET A 12%5`
Puts the remainder of (12/5), or 2, into "A."

`LET A 1?10`
Picks a random number between 1 and 10, and puts it into "A."

`LET A 10/2-1`
Puts the value of (10/(2-1)), or 10, into "A." Note, this example shows that Web Turtle has no operator presidence! All operations occur from right to left!

"Web Turtle," created by Bill Kendrick, 1997-2017.