# TXL

TXL is an actively used programming language created in 1985.

34Years Old | 1,020Users | 0Jobs |

- TXL ranks in the top 20% of languages
- the TXL wikipedia page
- TXL first appeared in 1985
- See also: turing, yacc, refal
- I have 45 facts about TXL. just email me if you need more.

### Example code from Linguist:

% Calculator.Txl - simple numerical expression evaluator % Part I. Syntax specification define program [expression] end define define expression [term] | [expression] [addop] [term] end define define term [primary] | [term] [mulop] [primary] end define define primary [number] | ( [expression] ) end define define addop '+ | '- end define define mulop '* | '/ end define % Part 2. Transformation rules rule main replace [expression] E [expression] construct NewE [expression] E [resolveAddition] [resolveSubtraction] [resolveMultiplication] [resolveDivision] [resolveParentheses] where not NewE [= E] by NewE end rule rule resolveAddition replace [expression] N1 [number] + N2 [number] by N1 [+ N2] end rule rule resolveSubtraction replace [expression] N1 [number] - N2 [number] by N1 [- N2] end rule rule resolveMultiplication replace [term] N1 [number] * N2 [number] by N1 [* N2] end rule rule resolveDivision replace [term] N1 [number] / N2 [number] by N1 [/ N2] end rule rule resolveParentheses replace [primary] ( N [number] ) by N end rule

### Example code from Wikipedia:

function fact replace [number] n [number] construct nMinusOne [number] n [- 1] where n [> 1] construct factMinusOne [number] nMinusOne [fact] by n [* factMinusOne] end function function fact0 replace [number] 0 by 1 end functionEdit

Last updated February 11th, 2019