From: Maxximo <mssmsoft AT my-dejanews DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: I need help adressing characters in a string
Date: Tue, 27 Apr 1999 11:05:57 GMT
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To: djgpp AT delorie DOT com
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> Well, consider this :
>
> char *string;
>
> void main (void)
> {
>  int i;
>  for (i=; i=lengthof(string); i++)
>   {
>   dosomething with string[i];
>   }
>
> I can't do that, the compiler gives me an error.
>
> How should I declare the string?
>

First of all: you have a real string or a pointer to it?
If you referred a string declared somewhere in your code, you must declare:

extern char *string;
or
extern char string[];

If you only declare:
char *string;

you have declared a pointer, but you must initialize it with the address of a
string.

Then, first declare your string: char my_string[20]; or declare and
initialize it: char my_string[] = "hello, World"; Remember: the string is
terminated with a character '\0'. You must provide space for this in your
declaration.

If you want, you can declare a pointer to it:

char *string;

and initialize it with:

string = my_string;

or (it is the same):

string = &my_string[0];

Look this:


char string[] = "Hello, World!"
main()
{
	char *pointer;
	int i;

	for(i=0; i<strlen(string); i++) {
		putchar(string[i]);
	}

	/* or with a pointer */
	/* you can loop checking the end of the string ('\0') */
	pointer = string;
	while(*pointer != '\0') {
		putchar (*pointer);
		pointer++;
	}
}

I hope this help you

bye
Maxximo


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