By W. P. SALMAN, O. Tisserand, B. Toulout
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All values are signed M* M* ( n1 n2 --- d ) Multiplies two 16-bit numbers and gives a 32-bit number result b ) d1 d2 --- b ( d --- ) d n --- d Compares two 32-bit numbers. Returns true if d1
PLAY CR BEGIN 32 WORD HERE 1+ C@ WHILE HERE COUNT TYPE CR REPEAT
FORTH has the following words to help here. M+ MI U/MOD M* U* M*I ( ( ( ( ( ( d n --- d-sum ) d n --- n-quotient ) (integer division ud u --- u-remainder u-quotient n1 n2 d-product ) u1 u2 ud-product ) d n u d-result ) In the same way that +1 used a double-length intermediate result, uses a triple-length intermediate result. Try to familiarise yourself with these different words by using them on examples of your own choosing. 5 Fixed Point Versus Floating Point As you will have no doubt noticed, up until now we have only introduced arithmetic words working on integers.