Converts a numeric expression to a double-precision value.
CDBL(numeric_expression)
numeric_expression is any numeric expression.
Using CDBL is equivalent to assigning the expression to a double-precision variable.
Single-precision values have 7 significant digits. Double-precision values have 15 significant digits.
A=454.67
PRINT A; CDBL(A)
454.67 454.6700134277344
Prints a double-precision version of the single-precision value stored in the variable named A.
The last 11 numbers in the double-precision number have no meaning in this example, since A was previously defined to only two-decimal place accuracy.
See the CINT, CLNG and CSNG functions for converting numbers to integer, long and single precision, respectively.