[sdiy] Pointers in C

[Richard Wentk]

Pointers include (sizeof) information, so - if I remember correctly - ++ always adds the size of the data type.

This may not be what you want.

If you want to access individual bytes, you can just add 1 (or 2 or 3...) to the pointer.

See also

http://www.cs.umd.edu/class/sum2003/cmsc311/Notes/BitOp/pointer.html

Richard

On 31 Dec 2011, at 11:42, Paul Maddox <yo at vacoloco.net> wrote:

> All,
> 
>  Pointers have always confused me, though I'm getting better slowly.
> 
>  But I have a question, if I have a pointer to an unsigned long int (32bits) and I want to access it as four unsigned chars, do I just read a char and increase the pointer? for example;
> 
> int *my_ptr = my_unsigned_long_int;
> unsigned char FirstByte = *my_ptr;
> my_ptr++;
> unsigned char SecondByte = *my_ptr;
> my_ptr++;
> unsigned char ThirdByte = *my_ptr;
> my_ptr++;
> unsigned char FourthByte = *my_ptr;
> 
>  or am I nuts?
> 
> Paul
> 
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> 
> http://VacoLoco.net
> 
> 
> 
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