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Storing multiple things in a variable?
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So, I was trying to re-create the CMD command "set /p", where it prompts the user to type text, and is ended by a carriage return.
Upon trying this, however, I found that a word (dw) will only hold the last thing passed to it. You can type "abcdefg", but the word will only hold the value "g".
What I'm trying to ask is, would there be a way to make it store everything typed, like.. create a string out of a series of characters?
I'm using NASM16 under a windows operating system.
Upon trying this, however, I found that a word (dw) will only hold the last thing passed to it. You can type "abcdefg", but the word will only hold the value "g".
What I'm trying to ask is, would there be a way to make it store everything typed, like.. create a string out of a series of characters?
I'm using NASM16 under a windows operating system.
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#2 34 Days Ago
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Originally Posted by Goalatio 
...I found that a word (dw) will only hold the last thing passed to it. You can type "abcdefg", but the word will only hold the value "g"...
store will always refer to the same memory location, so every time you write to it, whatever value was there is overwritten by the new value.•
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Originally Posted by Goalatio
...What I'm trying to ask is, would there be a way to make it store everything typed, like.. create a string out of a series of characters?
store only points at a single location, no.What you want is a series of storage locations, with
store pointing at the start... instead of dw 0 , do something like times 100 dw 0 . Then all you need is another variable to hold the address in which to store the next input character. Start it out pointing at store , and every time you read a character, load it into the location at the address of store plus the value of the variable, then increment the variable. That way all of the input characters are saved at different locations, and you have all of them.Additional thoughts:
You don't have infinite space to keep recording characters, so you'll have to decide how much space to reserve and what happens if someone types more characters before they hit the carriage return.
Instead of defining
store as a series of 0 bytes, try filling it with '$' --that way, no matter how many characters get typed in, there's always '$' after what was typed, so you get the string terminator for free. If you do it that way, you'll need one more '$' than your maximum character count; always save one for the end of the string.Character values are coming in
al , an 8-bit register, but you're using dw for storage, which is 16 bits... Maybe your Library.asm is looking for 16-bit characters, but if it isn't, consider db instead. --smg
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#3 33 Days Ago
As to storing multiple things in a variable,
a word is really two contiguous bytes:
and can hold two asci values.
If we reserve room for an array of bytes:
albl2 is a label which represents a 16-bit offset, and
we can use it to index into the array, or pass
it as a parameter to 21/3F for example:
a word is really two contiguous bytes:
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If we reserve room for an array of bytes:
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we can use it to index into the array, or pass
it as a parameter to 21/3F for example:
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To control a mind violates a man, and all it has been used for is
hurting and afflicting. Nowonder I progam in assembly...
--->Now available http://dotcoding.netai.net/
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#4 31 Days Ago
Great! You've really been helping me out on my projects, I really appreciate it. 
I'll re-post my code once I get this setup correctly, but here is what I have as of now, try using ALT-NUMPAD ascii codes on it, I was surprised that those worked so easily.
As always, I am using my own library.. So you may see a few things you do not recognize.
And I suppose it would be of benefit to post my library too.
I'll re-post my code once I get this setup correctly, but here is what I have as of now, try using ALT-NUMPAD ascii codes on it, I was surprised that those worked so easily.
As always, I am using my own library.. So you may see a few things you do not recognize.
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And I suppose it would be of benefit to post my library too.
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Last edited by Goalatio; 31 Days Ago at 7:15 pm.
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