Table of Contents

8. The optional Double-Number word set

See: A.8 The optional Double-Number word set

See: 3.2.6 Environmental queries

Table 8.1 - Environmental Query Strings

String         Value data type   Constant?   Meaning
------         ---------------   ---------   -------
DOUBLE          flag             no          double-number word set present
DOUBLE-EXT      flag             no          double-number extensions word set present

For example, entering DECIMAL 1234 leaves the single-cell number 1234 on the stack, and entering DECIMAL 1234. leaves the double-cell number 1234 0 on the stack.

See: 3.4.1.3 Text interpreter input number conversion, RFI 0004 Number Conversion.

• no additional requirements.

• d outside range of n in 8.6.1.1140 D>S.

• no additional requirements.

• no additional requirements.

The phrase Providing name(s) from the Double-Number Extensions word set shall be appended to the label of any Standard System that provides portions of the Double-Number Extensions word set.

The phrase Providing the Double-Number Extensions word set shall be appended to the label of any Standard System that provides all of the Double-Number and Double-Number Extensions word sets.

The phrase Requiring name(s) from the Double-Number Extensions word set shall be appended to the label of Standard Programs that require the system to provide portions of the Double-Number Extensions word set.

The phrase Requiring the Double-Number Extensions word set shall be appended to the label of Standard Programs that require the system to provide all of the Double-Number and Double-Number Extensions word sets.

        ( x1 x2 "<spaces>name" -- )

Skip leading space delimiters. Parse name delimited by a space. Create a definition for name with the execution semantics defined below.

name is referred to as a two-constant.

        name Execution: ( -- x1 x2 )

Place cell pair x1 x2 on the stack.

See: 3.4.1 Parsing, A.8.6.1.0360 2CONSTANT

        Interpretation: Interpretation semantics for this word are undefined.

        Compilation: ( x1 x2 -- )

Append the run-time semantics below to the current definition.

        Run-time: ( -- x1 x2 )

Place cell pair x1 x2 on the stack.

See: A.8.6.1.0390 2LITERAL

        ( "<spaces>name" -- )

Skip leading space delimiters. Parse name delimited by a space. Create a definition for name with the execution semantics defined below. Reserve two consecutive cells of data space.

name is referred to as a two-variable.

        name Execution: ( -- a-addr )

a-addr is the address of the first (lowest address) cell of two consecutive cells in data space reserved by 2VARIABLE when it defined name. A program is responsible for initializing the contents.

See: 3.4.1 Parsing, 6.1.2410 VARIABLE , A.8.6.1.0440 2VARIABLE

        ( d1|ud1 d2|ud2 -- d3|ud3 )

Add d2|ud2 to d1|ud1, giving the sum d3|ud3.

        ( d1|ud1 d2|ud2 -- d3|ud3 )

Subtract d2|ud2 from d1|ud1, giving the difference d3|ud3.

        ( d -- )

Display d in free field format.

        ( d n -- )

Display d right aligned in a field n characters wide. If the number of characters required to display d is greater than n, all digits are displayed with no leading spaces in a field as wide as necessary.

See: A.8.6.1.1070 D.R

        ( d -- flag )

flag is true if and only if d is less than zero.

        ( xd -- flag )

flag is true if and only if xd is equal to zero.

        ( xd1 -- xd2 )

xd2 is the result of shifting xd1 one bit toward the most-significant bit, filling the vacated least-significant bit with zero.

See: A.8.6.1.1090 D2*

        ( xd1 -- xd2 )

xd2 is the result of shifting xd1 one bit toward the least-significant bit, leaving the most-significant bit unchanged.

See: A.8.6.1.1100 D2/

        ( d1 d2 -- flag )

flag is true if and only if d1 is less than d2.

        ( xd1 xd2 -- flag )

flag is true if and only if xd1 is bit-for-bit the same as xd2.

        ( d -- n )

n is the equivalent of d. An ambiguous condition exists if d lies outside the range of a signed single-cell number.

See: A.8.6.1.1140 D>S

        ( d -- ud )

ud is the absolute value of d.

        ( d1 d2 -- d3 )

d3 is the greater of d1 and d2.

        ( d1 d2 -- d3 )

d3 is the lesser of d1 and d2.

        ( d1 -- d2 )

d2 is the negation of d1.

        ( d1 n1 +n2 -- d2 )

Multiply d1 by n1 producing the triple-cell intermediate result t. Divide t by +n2 giving the double-cell quotient d2. An ambiguous condition exists if +n2 is zero or negative, or the quotient lies outside of the range of a double-precision signed integer.

See: A.8.6.1.1820 M*/

        ( d1|ud1 n -- d2|ud2 )

Add n to d1|ud1, giving the sum d2|ud2.

See: A.8.6.1.1830 M+

        ( x1 x2 x3 x4 x5 x6 -- x3 x4 x5 x6 x1 x2 )

Rotate the top three cell pairs on the stack bringing cell pair x1 x2 to the top of the stack.

        ( ud1 ud2 -- flag )

flag is true if and only if ud1 is less than ud2.