DF!

( df-addr -- ) ( F: r -- ) or ( r df-addr -- )

Store the floating-point number r as a 64-bit IEEE double-precision number at df-addr. If the significand of the internal representation of r has more precision than the IEEE double-precision format, it will be rounded using the "round to nearest" rule. An ambiguous condition exists if the exponent of r is too large to be accommodated in IEEE double-precision format.

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