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Add ?dup

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This commit is contained in:
Koichi Nakamura 2021-01-01 20:47:08 +09:00
parent e11e1f782e
commit a1242df09e
1 changed files with 4 additions and 0 deletions
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4
core.fs
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@ -629,6 +629,10 @@ alias-builtin xor ^
[compile] if
; immediate
\ ( n -- n n | n )
\ duplicate if n<>0
: ?dup dup if dup then ;
\ === Loops ===
\ begin <body> <condition> until
\ begin <body> again