y=100
Module CheckEval {
      A$="1 + 2 * (3 + (4 * 5 + 6 * 7 * 8) - 9) / 10"
      Print Eval(A$)
      x=10
      Print Eval("x+5")=x+5
      Print Eval("A$=A$")=True
      Try {
            Print Eval("y")  ' error: y is uknown here
      }
}
Call CheckEval