?? demo5.th
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( recursive factorial. given x on top, followed by )( an "accumulator" containing the product except for x! ): fact-help2 dup if swap over swap * swap 1 - fact-help2 then;: fact 1 swap fact-help2 drop;: demo5 " The factorial of 3 is: " 3 fact . cr " The factorial of 5 is: " 5 fact . cr;demo5?? 快捷鍵說明
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