Updated documentation.

[fifth.git] / doc / commands / math&mem.txt

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-                       Math, memory & stack manipulation\r
-                       ---------------------------------\r
-\r
-\r
-off            ( n -- ) writes 0 to given address, good for zeroing variable.\r
-               ex: MyVariable off\r
-on             ( n -- ) writes -1 (true flag) to given address.\r
-               ex: MyVariable on\r
-\r
-2dup           ( n1 n2 -- n1 n2 n1 n2 )\r
-2drop          ( n1 n2 -- )\r
-nip            ( n1 n2 -- n2 )\r
-neg            ( n1 -- -n1 ) negotiate\r
-bit@           ( n bit -- result ) return specified bit from n.\r
-               ex: 38 2 bit@   (result will be 1)\r
-to32bit        ( n1 n2 n3 n4 -- n32 ) treat 4 last stack elements as bytes\r
-               and unite them into 32 bit dword. Most significant byte\r
-               on top.\r
-               ex: 12 76 23 11 to32bit   result: 186076172\r
-\r
-to8bit         ( n32 -- n1 n2 n3 n4 ) break 32 bit number into 4 bytes.\r
-               Useful if you need to send 32 bit numbers thru 8 bit COM\r
-               port.\r
-               ex: 186076172 to8bit   result: 12 76 23 11\r
-\r
-mod            ( n1 n2 -- reminder ) divide n1 by n2 and returns reminder.\r
-               ex: 12 5 mod   result: 2\r
-\r
-bound          ( low n high -- n ) check if n is in given bounds,\r
-               if not then incarease/decarease it to match bounds.\r
-               ex: 5 80 15 bound    result: 15\r
-                   5 10 15 bound    result: 10\r
-                   5 -10 15 bound   result: 5\r
-\r
-bound?         ( low n high -- result ) returns true if n is in the\r
-               given bounds.\r
-\r
-tab            ( col -- spaces) calculate amount of spaces to add\r
-               ta reach next tabulation from given column.\r
-\r
-count          ( addr -- addr+1 n )\r
-               Useful for returning bytes from constantly incareasing\r
-               address. Module "type" is nice example.\r
-\r
-c,             ( n -- )\r
-               store one byte at memory specified by "h". And incarease\r
-               "h" by 1.\r
-\r
-,              ( n -- )\r
-               store 32 bit number at memory specified by "h". And\r
-               incarease "h" by 4.\r
-\r
-cmove          ( addr1 addr2 n -- )\r
-               copy "n" amount of bytes from memory at "addr1" to memory\r
-               at "addr2".\r
-\r
-rnd            ( limit -- result )\r
-               generates random number in range 0 to "limit"-1.\r
-\r
-abs            ( n -- |n| )\r
-               returns absolute value of "n"\r