Beatnik (programming language)
# Beatnik (programming language)

Beatnik is a simple stack-oriented esoteric programming language, by Cliff L. Biffle. A Beatnik program consists of any sequence of English words. Each word is assigned the score one would get for it in a Scrabble game. The value of the score determines what function is performed. Functions include pushing the score of the next word onto the stack, testing the stack and skipping forward or backward in the program and other stack operations.

## Overview

### Markup

The interpreter reads the words in the poem, ignoring punctuation and whitespace and newlines. Some functions are one word, other functions have an argument (they are two-word functions). Two-word functions are described below in the form "5,n". This means both the word whose value is 5 and the next word (whose value is 'n') are read.

Commands :

| Word value | Pseudo-code | Description |
| - | - | - |
| <5 | NOOP | Optional: Interpreter may mock you |
| 5,n | push(n) | Push the next word's value onto the stack. |
| 6 | pop | Pop a number from the stack and discard it. |
| 7 | push(pop+pop) | Pop two numbers, add them, and push the result. |
| 8 | push(input) | Input a character and push its value. |
| 9 | print(pop) | Pop a number and output it as a character. |
| 10 | push(pop-pop) | Pop two numbers, subtract the first one popped from the second one popped, and push the result. |
| 11 | a = pop; b = pop; push(a); push(b) | Pop two numbers, swap them, and push them back. |
| 12 | a = pop; push(a); push(a) | Pop a number and push it twice. |
| 13,n | if(top==0) jump(+n) | Pop a number and skip ahead n (actually n+1) words if the number is zero. |
| 14,n | if(top!=0) jump(+n) | Pop a number and skip ahead n (actually n+1) words if the number isn't zero. |
| 15,n | if(top==0) jump(-n) | Pop a number and skip back n words if the number is zero. |
| 16,n | if(top!=0) jump(-n) | Pop a number and skip back n words if the number isn't zero. |
| 17 | exit | Stop the program. |
| 18-23 | NOOP | Optional: may mock you, but only if it has had a bad day. |
| >23 | — | Generates "Beatnik applause". |

Legend :

| Pseudo-code | Meaning |
| - | - |
| NOOP | No operation |
| pop | remove the value off the top of the stack, and return it |
| push(x) | place x on the stack |
| print(x) | print the character x |
| input | read a character from the user. Blocks until character is read. |
| ; | separates multiple statements. They are run in order. |
| if(expression) statement | if and only if the expression is true, execute the statement |
| jump(x) | move the reading location forward or backwards by x words. |

Here are the scrabble letter values, for reference.

## Examples

### Hello World

A "Hello World" example in the Beatnik language.

