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                用于變量賦值的函數有兩個 #### **1、setq** 簽名:`(setq sym expr [sym expr] ...)` 功能:將一個或多個符號的值設置為對應表達式的值 返回值為最有一個表達式的值 示例: ~~~ (setq b 123 c 4.7) 4.7 ~~~ 執行后,b的值是123,c的值是4.7 #### **2、set** 簽名:`(set expr1 expr2)` 說明:set執行時 ,首先對expr1求值,返回一個符號sym1,然后對expr2求值,得到val2,然后將val2賦值給sym1 示例: ``` (set (quote a) 9) ;9 (set 'b 11) ;11 (set (read "aa") 5) ;5 !aa ;5 (set (type 5) 6) ;6 !int ;5 ``` #### **3、給變量賦值nil可以釋放此變量占用的內存** ``` 命令: (setq bb nil) nil ```
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