Introduction to Var'aq Programming |

*This Site* is intended to provide helps
to Var'aq language programmers around the world through technical examples, informational
articles, and personal assistance.

The following examples are meant to be a quick * Getting Started* sort of tutorial using the

**Example 3. Stack Operations**

To understand better the order in which things are done in Var'aq, one has to understand
the concept of "pushing" and "popping" items on a "stack". The * stack* is
a specially-managed structure into which items are placed and subsequently operated upon or removed. In the simple arithmetic example
two numbers are "pushed" onto the stack, then the '+' operator "pops" them for a short
time to find their sum, and then "pushes" the result back onto the stack for the next
operation.

Because things on the stack sometimes arrive in the wrong order for an upcoming operation, most stack-based languages provide some basic stack operations for making necessary position adjustments.

`10 "The answer is " cha' cha'`

`cha'`

instruction prints "The answer is ", and the second
`cha'`

instruction prints "10".`10 "The answer is " woD cha'`

`woD`

"pops"--discards--"The answer is ", and the
`cha'`

instruction prints "10".`10 "The answer is " tam woD cha'`

`tam`

swaps the top two items on the stack: "The answer is " and
10, then the
`woD`

"pops"--discards--10, and the
`cha'`

instruction prints "The answer is ".`10 "The answer is " woD latlh boq cha'`

`woD`

"pops"--discards--"The answer is ", and the
`latlh`

duplicates the 10, `boq`

adds the two 10's,
and the `cha'`

instruction prints "20".See the Var'aq specification for the arithmetic operators supported by Var'aq.

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**©Copyright 2004, Mr. Merrick J. Stemen. All rights reserved.**