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POAssembly Random Number Using Irvine
 

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  1. POAssembly Random Number Using Irvine
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    <p>When I implement the random number generator procedure that was provided for us in Assembly, half the time it gives me a division by zero error and the other half of the time it works perfectly. I believe that I am implementing the code properly, but will provide you how I have it written. </p> <pre><code>randomCompNum PROC call Randomize ;Sets seed mov eax,10 ;Keeps the range 0 - 9 call RandomRange mov compNum1,eax ;First random number L1: call RandomRange .IF eax == compNum1 ;Checks if the second number is the same as the first jmp L1 ;If it is, repeat call .ENDIF mov compNum2,eax ;Second random number L2: call RandomRange .IF eax == compNum1 ;Checks if the third number is the same as the first jmp L2 ;If it is, repeat .ELSEIF eax == compNum1 ;Checks if the third number is the same as the second jmp L2 ;If it is, repeat .ENDIF mov compNum3,eax ;Third random number stored ret randomCompNum ENDP </code></pre> <hr> <p>Here's the disassembly for RandomRange that Visual Studios provided me</p> <pre><code>_RandomRange@0: 004019C1 push ebx 004019C2 push edx 004019C3 mov ebx,eax 004019C5 call _Random32@0 (4019A6h) ;&lt;---- This function doesn't touch ebx 004019CA mov edx,0 004019CF div eax,ebx ;&lt;---- That's where the error occurs 004019D1 mov eax,edx 004019D3 pop edx 004019D4 pop ebx 004019D5 ret </code></pre> <p>Do you know what could be causing this error? </p> <p>I'm tempted to just create my own random number generator.</p> <p><strong>Background on the RandomRange method:</strong> It's simple. You set the seed with Randomize, moving 10 into eax keeps the RandomRange between 0 - 9. That's all the documentation I could find for that function, so that's all I believe there is about it.</p>
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    1. COThere's no such instruction as "div eax, ebx". What's the real code?
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    2. COThat was the code that the disassembler gave to me. I didn't write it.
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    3. COHow's that instruction encoded? What are the bytes that make it up (they would've been at addresses 004019CF and 004019D0)?
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