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Up to [CSRG BSD Unix] / 43BSD / contrib / icon / book / 19

BSD 4.3

procedure main()
   while write(fix(read()))
end

procedure fix(exp)
   while exp ?:= 2(="(",tab(bal(')')),pos(-1))
   return lassoc(exp,'+-' | '*/') | rassoc(exp,'^') | exp
end

procedure lassoc(exp,op)
   local j
   return exp ? {
      every j := bal(op)
      form(tab(\j),move(1),tab(0))
      }
end

procedure rassoc(exp,op)
   return exp ? form(tab(bal(op)),move(1),tab(0))
end

procedure form(arg1,op,arg2)
   return op || "(" || fix(arg1) || "," || fix(arg2) || ")"
end

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