DecimalString←{
⍝ Not optimal in any sense other than this was fairly quick to write
⍝ Return decimal representation, parenthesising decimals if repeating
     div←⍺÷⍵
     (n d)←(,÷∨)∘1⊢div   ⍝ Numerator and denominator reduced
     r←×≢2 5~⍨∊{⍵⌿⍨2=≢⍸(⊢=⌊)⍵÷⍳⍵}¨(∪⊢∨⍳)d ⍝ Does the decimal repeat indefinitely?
     ∊⍕¨(⌊div)('.')({'(',⍵,')'}⍣r⊢(2↓∪¯1↓⍣r⊢⍕1|div))
⍝ Examples
⍝       1 DecimalString 3
⍝ 0.(3)
⍝       1 DecimalString 2
⍝ 0.5
⍝       10 DecimalString 132
⍝ 0.(75)
⍝       1 DecimalString 24
⍝ 0.(416)
⍝       1 DecimalString 26
⍝ 0.(384615)
⍝       1 DecimalString 25
⍝ 0.4

 }