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6.2

Generating 3 randoms (assembly/tasm)

Asked by ruistorm in Assembly Programming Language

Tags: symbol, tasm, undefined

>This is one of the simplest random generator one can come up with.
>It is based on the iterative formula RAND = (RAND * P1 + P2) % RAND_MAX

>Common values for P1 and P2 are 1103515245 and 12345
>RAND_MAX is 2^31 -1



seed     dd 0
rnd1     db 0
rnd2     db 0
rnd3     db 0

...

    call init_gen     ; initialize the seed
   
     call gen_next     ; generate the numbers
    mov [rnd1], dl
    call gen_next
    mov [rnd2], dl
    call gen_next
    mov [rnd3], dl    

...


init_gen:
    mov ah, 2ch
    int 21h          ; get hundreds of sec
    mov word ptr seed, dl ; init seed with it
    ret


gen_next:
    mov eax, [seed]
    mov ebx, 1103515245
    mul ebx               ; RND = RAND*P1
    add eax, 12345          ; RAND += P2    
     and eax, 2147483647     ; RAND %= RAND_MAX
    mov [seed], eax

    xor dx, dx    
    mov bx, 6
    div bx          ; remainder is between 0 and 5
    inc dl          ; now between 1 and 6
    ret

 
I'm having this errors in that piece of code:

Operand types do not match -> mov word ptr seed, dl
Undefined symbol: eax, ebx...

how do I solve it?  
 
Related Solutions
Keywords: Generating 3 randoms (assembly/ta…
Title
1 Random in Assembly/ASM (tasm)
 
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About this solution

Zone: Assembly Programming Language
Tags: symbol, tasm, undefined
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Solution Provided By: belgiansprout
Participating Experts: 2
Solution Grade: A
 
 
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