memorey addresses question

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09-20-2011
c_weed

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memorey addresses question

Why is it adjacent memorey addresses differ by 4?
Attachment 10887
09-20-2011
brewbuck

The "memory content" column is showing values which are four bytes in length, and your question is, why are the associated addresses differing by four bytes each time?

Can you put in words, what you think this chart is displaying?
09-20-2011
c_weed

Quote:

Originally Posted by brewbuck

The "memory content" column is showing values which are four bytes in length, and your question is, why are the associated addresses differing by four bytes each time?

Can you put in words, what you think this chart is displaying?

What happened to addresses 0xC001, 0xC002, 0xC003 for example? How do you know the memory content is 4 bytes in length? How is that possible that a memory address can be mapped to something other than 1 byte?
09-20-2011
CommonTater

Quote:

Originally Posted by c_weed

What happened to addresses 0xC001, 0xC002, 0xC003 for example? How do you know the memory content is 4 bytes in length? How is that possible that a memory address can be mapped to something other than 1 byte?

Gee, I dunno, because the value being stored is 4 bytes long?

Code:

printf("%d", sizeof(int));

What do you get back?

Unless you are on some seriously old and outdated compiler, it will print 4 ... so in order to store 1 int you need 4 bytes of memory... thus one variable every 4 bytes... just like your image.
09-20-2011
c_weed

Quote:

Originally Posted by CommonTater

Gee, I dunno, because the value being stored is 4 bytes long?

Code:

printf("%d", sizeof(int));

What do you get back?

Unless you are on some seriously old and outdated compiler, it will print 4 ... so in order to store 1 int you need 4 bytes of memory... thus one variable every 4 bytes... just like your image.

Oh ya I get it now.
09-21-2011
Elysia

Whatever is stored in memory is 1s and 0s, so it really doesn't contain any information about what length data stored is.
In other words, it's showing them grouped by 4 bytes simply because you told it to do so. You can change that to other things (typically to a multiple of a byte).