Forth 2012: D.R

( 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.

Rationale:

In D.R, the "R" is short for RIGHT.

Testing:

MAX-2INT 71 73 M*/ 2CONSTANT dbl1
MIN-2INT 73 79 M*/ 2CONSTANT dbl2

: d>ascii ( d -- caddr u )
DUP >R <# DABS #S R> SIGN #> ( -- caddr1 u )
HERE SWAP 2DUP 2>R CHARS DUP ALLOT MOVE 2R>
;

dbl1 d>ascii 2CONSTANT "dbl1"
dbl2 d>ascii 2CONSTANT "dbl2"

: DoubleOutput
   CR ." You should see lines duplicated:" CR
   5 SPACES "dbl1" TYPE CR
   5 SPACES dbl1 D. CR
   8 SPACES "dbl1" DUP >R TYPE CR
   5 SPACES dbl1 R> 3 + D.R CR
   5 SPACES "dbl2" TYPE CR
   5 SPACES dbl2 D. CR
   10 SPACES "dbl2" DUP >R TYPE CR
   5 SPACES dbl2 R> 5 + D.R CR
;

T{ DoubleOutput -> }T