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I want to pick out certain character out of a string stored in memory, but don't know how

str    db "hello",0
mov    rdi,str
call   puts

when I do this I get the output hello, but I want to know how to get the first character out. For example how do I move the first character h saved in some register?

Guoheng Chen
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1 Answers1

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mov  al, byte ptr [rdi]

will move one byte from the address pointed at by rdi into the al register (bottom 8 bits of rax)

Chris Dodd
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