Variables

Concatenative programs typically use the stack to store values temporarily while they perform calculations or to pass arguments from one word to another. When programmers need to store numbers more permanently, they use variables and constants.

Forth

To create a variable:

VARIABLE DATE

To store a variable:

12 DATE !

To read a variable:

DATE @

Locals in gforth

The curlies notation allow to do assignment of variables during the word definition.

: swap { a b -- b a }
       b a ;