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CDBL converts a numeric expression to a double-precision value.
 
CDBL(numeric-expression)
 
Usage Notes
    ■ This function has the same effect as assigning the numeric expression
      to a double-precision variable.
    ■ Note that the results of CDBL are no more accurate than the original
      expression. The added digits of precision are not significant unless
      the expression is calculated with double-precision accuracy.