I may be way off the mark here because I've never used C18, however, these
examples are either bad or wrong.

In C, a "char" is a single character, and normally one byte. A string is an
array of char .

Therefore,

const char str1 = "hello world";

is either illegal, or, depending on how the compiler handles it, might well
be the same as saying

const char str1 = 'h';

What you actually want to do is say:-

const char[] str1 = "hello world";

This will create str1 as a pointer to the first element of an array
preinitialised to contain that string, and null terminated.

Additionally,

const char * str3 = "hello world";

is also either illegal, or in some compilers will produce not quite the
effect you're looking for. It would potentially create a char pointer, which
is preconfigured to point to whatever value is represented by that string.
In Win32, pointers are 32 bit, so that would (in visual c++) create a const
char pointer that points to a memory address of "hell" (0x68656C6C), which
is an Access Violation / Protection fault waiting to happen.

Additionally, remember that a "const char *" is a pointer whose value (ie
what it points to) is fixed, however, you can (normally) write to the
address  pointed to by the pointer. eg:-

const char * c = 0x70

*c = 'A' ; // valid-> 0x70 now contains 'A'
c = &otherchar ; // invalid. c is const.



Hope that ramble helps :)

> -----Original Message-----
> From: Wouter van Ooijen [mailto:wouter@VOTI.NL]
> Sent: 27 October 2003 12:12
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: LCD String function
>
>
> > Cons unsigned char      str1 = "String number 1";
> > unsigned char           str2 = "String number 2";
> >
> >
> > Lcd_puts(str1);
> > Lcd_puts(str2);
> > Lcd_puts("String Number 3");
>
> Did you try that on C18? And did you try
>
> cons rom char * str3 = "String number 3";
> Lcd_puts(str3);
>
> Wouter van Ooijen
>
> -- -------------------------------------------
> Van Ooijen Technische Informatica: www.voti.nl
> consultancy, development, PICmicro products
>
> --
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