### 3.3.5 Incrementing variables

You can increase the value of a variable a by 4, for example, with

a:=a+4

If beforehand a were equal to 4, it would now be equal to 8. A shorthand way of doing this is with the += operator;

a+=4

will also increase the value of a by 4.

Similar shorthands exist for subtraction, multiplication and division. If a is equal to 8 and you enter

a-=2

then a will be equal to 6. If you follow this with

a*=3

then a will be equal to 18, and finally

a/=9

will end with a equal to 2.