word larger numbers

I have to multiply a byte for the word fixed 10000, and then divide the result by the fixed word 312 (example 73x10000 / 312). How can i do this when the result of the multiplication exceeds the maximum content of a word?

dummy_word_var = 73*10000
result_word_var= div32 312


[result=2339]

Or perhaps

Code:

---

73 */ 8205

---

Result = 2339

Or, if precision isn't THAT critical, since 10000/312 = 32.0513 which is pretty close to 32:

Code:

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73 <<  5

---

Result = 2336

Where obviously the last one will be the smallest and fastes option
/Henrik.

Quote:

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Originally Posted by richard

dummy_word_var = 73*10000
result_word_var= div32 312

---

but 73000 isnt' larger than a word?

never mind

PBP uses internal 32bit register for storing results(registers R1,R2,R3,R4 if I remember correctly). Maximum number that can be stored is 4294967295
Then DIV32 divide register with 312 in this example.

Look into Alexander Avtanski's N-Bit Math which is mentioned in this old post
http://www.picbasic.co.uk/forum/showthread.php?t=12433