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09-04-2013, 06:28 AM #1
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- Aug 2013
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x86 assembly program not adding up correctly
Newbie here so be kind please. I need AL to sum the ASCII characters in a name. For example, Joe should be 13E, but it is coming up 11E. If I put a space before and after Joe in the string, it sums up correctly. Can anyone see what I am doing wrong? Thanks for your help!
INCLUDE Irvine32.inc .data fullName BYTE "Joe",0 ; Store name in string nameSize = ($ - fullName) ; Variable to store length of name .code main PROC mov ECX,nameSize ; Set counter for loop mov ESI,OFFSET fullName ; Set pointer at name variable mov EAX,0 ; Clear the EAX register mov EBX,0 ; Clear the EBX register checkSum: ; Loop mov AL,[ESI + ECX - 1] ; Move to AL (8 bit register), point to characters in string add EBX,EAX ; Add EAX and EBX registers together loop checkSum ; Loop mov EAX,EBX ; Move EBX to EAX mov EBX,0 ; Clear EBX register call DumpRegs ; Display results exit main ENDP END main
09-04-2013, 04:13 PM #2
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- Aug 2006
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"Joe" looks to me like it sums to 11E. Are you sure you've looked it up with the "J" uppercase?
Nice to see someone writing assembly language.
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