# CDBL

### From QB64 Wiki

**CDBL** converts a value to the closest DOUBLE-precision value.

- doublevalue =
**CDBL(***expression***)**

- doublevalue =

- The
*expression*is any TYPE of literal or variable numerical value or mathematical calculation.

*Description:*

- Rounds to the closest DOUBLE floating decimal point value.
- Also can be used to define a value as DOUBLE-precision up to 15 decimals.

*Example:* Prints a double-precision version of the single-precision value stored in the variable named A.

A = 454.67
PRINT A; **CDBL**(A)

454.67 454.6700134277344

- The last 11 numbers in the double-precision number change the value in this example, since A was previously defined to only two-decimal place accuracy.

*See also:*

*Navigation:*