Examples/Roman
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The following function takes a decimal number and returns the equivalent in roman numerals. The comments to the right of the ⍝ symbol are for edification but are not necessary to use this function.
⎕vr 'roman' ⍝ System function to list the contents of a function
∇ result ← roman value ⍝ result is the output of the function; value is the number supplied
[1] result ← '' ⍝ set result to null to prevent VALUE ERROR
[2] M: →(value<1000)/CM ⍝ if the value is less than 1000, go to label CM
[3] result ← result,'m' ⍝ for each 1000, tack an 'm' onto result and reduce value by 1000
[4] value ←value-1000
[5] →M ⍝ go back to label M
[6] CM: →(value<900)/D ⍝ if the value is less than 900, go to label D
[7] result ← result,'cm' ⍝ tack a 'cm' on result and reduce value by 900
[8] value ←value-900
[9] D: →(value<500)/CD ⍝ if the value is less than 500, go to label CD
[10] result ← result,'d'
[11] value ←value-500
[12] CD: →(value<400)/C ⍝ if the value is less than 400, go to label C
[13] result ← result,'cd'
[14] value ←value-500
[15] C: →(value<100)/XC ⍝ if the value is less than 100, go to label XC
[16] result ← result,'c'
[17] value ←value-100
[18] →C
[19] XC: →(value<90)/L ⍝ if the value is less than 90, go to label L
[20] result ← result,'xc'
[21] value ←value-90
[22] L: →(value<50)/XL ⍝ if the value is less than 50, go to label XL
[23] result ← result,'l'
[24] value ←value-50
[25] XL: →(value<40)/X ⍝ if the value is less than 40, go to label X
[26] result ← result,'xl'
[27] value ←value-40
[28] X: →(value<10)/IX ⍝ if the value is less than 10, go to label IX
[29] result ← result,'x'
[30] value ←value-10
[31] →X
[32] IX: →(value<9)/V ⍝ if the value is less than 9, go to label V
[33] result ← result,'ix'
[34] value ←value-9
[35] V: →(value<5)/IV ⍝ if the value is less than 5, go to label IV
[36] result ← result,'v'
[37] value ←value-5
[38] IV: →(value<4)/I ⍝ if the value is less than 4, go to label I
[39] result ← result,'iv'
[40] value ←value-4
[41] I: →(value<1)/0 ⍝ if the value is less than 1, go to 0, which exits the function
[42] result ← result,'i'
[43] value ←value-1
[44] →I
∇ 2013 3 18 11 42 9 262 (UTC) ⍝ this is when the function was last edited
| See Also | ||
| System Commands | System Variables and Functions | Operators |
| Keyboard | ||||||||||||||
| Alt+Shift | ⍪ | ≡ | ≢ | ⍒ | ⍋ | ⌽ | ⍉ | ⊖ | ⍟ | ⍱ | ⍲ | ⍠ | ⌹ | |
| Alt | ⋄ | ¨ | ¯ | < | ≤ | ∅ | ≥ | > | ≠ | ∨ | ∧ | × | ÷ | |
| Shift | ~ | ! | @ | # | $ | % | ^ | & | * | ( | ) | _ | + | |
| Key | ` | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 0 | - | = | |
| Alt+Shift | ⍷ | √ | ⍨ | ⍸ | ⍥ | ⍣ | ⍞ | ⍬ | ⊣ | |||||
| Alt | ? | ⍵ | ∊ | ⍴ | § | ↑ | ↓ | ⍳ | ○ | π | ← | → | ⊢ | |
| Shift | Q | W | E | R | T | Y | U | I | O | P | { | } | | | |
| Key | q | w | e | r | t | y | u | i | o | p | [ | ] | \ | |
| Alt+Shift | ∫ | ∂ | ⌻ | ⍢ | ⍙ | ⍤ | ⍫ | ⌷ | ||||||
| Alt | ⍺ | ⌈ | ⌊ | ∞ | ∇ | ∆ | ∘ | ‼ | ⎕ | ⍎ | ⍕ | |||
| Shift | A | S | D | F | G | H | J | K | L | : | " | |||
| Key | a | s | d | f | g | h | j | k | l | ; | ' | |||
| Alt+Shift | ⊆ | ⊇ | χ | ⍡ | ⍭ | ⊙ | ||||||||
| Alt | ⊂ | ⊃ | ∩ | ∪ | ⊥ | ⊤ | ⍦ | ⍝ | ⍀ | ⌿ | ||||
| Shift | Z | X | C | V | B | N | M | < | > | ? | ||||
| Key | z | x | c | v | b | n | m | , | . | / | ||||
| NARS 2000 Lang Tool Bar |
← | → | + | - | × | ÷ | * | ⍟ | ⌹ | ○ | ! | ? | √ | | | ⌈ | ⌊ | ⊥ | ⊤ | ⊣ | ⊢ | |||
| ≡ | ≢ | < | ≤ | = | ≥ | > | ≠ | ∨ | ∧ | ⍱ | ⍲ | ↑ | ↓ | ⊂ | ⊃ | ⌷ | ⍋ | ⍒ | |||||
| ⍳ | ∊ | ⍸ | ⍷ | ∪ | ∩ | ⊆ | ⊇ | ~ | § | π | .. | , | ⍪ | ⍴ | ⌽ | ⊖ | ⍉ | ||||||
| / | \ | ⌿ | ⍀ | ⊙ | ¨ | ⍨ | ⍤ | ⍣ | ⍡ | ⍥ | ⍦ | . | ∘ | ⍠ | ‼ | ⌻ | ∂ | ∫ | ⍞ | ⎕ | ⍎ | ⍕ | |
| ⋄ | ⍝ | ∇ | ∆ | ⍙ | _ | ⍺ | ⍵ | ¯ | ⍬ | ∞ | ∅ | ||||||||||||
| Second Row | i j k | i j k l | g | p | r | v | x | ||||||||||||||||
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