20 lines
415 B
Forth
20 lines
415 B
Forth
: caesar ( c n -- c )
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over 32 or [char] a -
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dup 0 26 within if
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over + 25 > if 26 - then +
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else 2drop then ;
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: caesar-string ( n str len -- )
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over + swap do i c@ over caesar i c! loop drop ;
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: caesar-inverse ( n -- 'n ) 26 swap - 26 mod ;
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2variable test
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s" The five boxing wizards jump quickly!" test 2!
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3 test 2@ caesar-string
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test 2@ cr type
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3 caesar-inverse test 2@ caesar-string
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test 2@ cr type
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