Thread: functions??

Hi? is anyone good at functions in C programming??

i need to implement a function say mystring() that will return a pointer to the next string in storage (starting with the first); returning a NULL pointer at the end of the list.

How would i implement this? can anyone help me here please..

cheers
Atif.

You could try using linked lists instead of a function
Something like this:


char str[20];
struct string
{
char colour[20];
struct string *next;
}start, *node;

start.next = NULL;
node = &start;

for (i = 0; i < number; i++) // how many strings
{
scanf("%s" , str);
node->next = (struct string *) malloc(sizeof (struct string));
node = node->next;
node->colour = str;
node->next = NULL;
}

Don't know how well it will work for you but you can try it.

Hi ? does anyone know how to convert this linked list code into a function..say i need to implement a function dumpstring(),each call to dumpstring() will return a pointer to the next string in storage (starting with the first); returning a NULL pointer at the end of the list.

cheers

Atif.

here is the linked list..

char str[20];
struct string
{
char colour[20];
struct string *next;
}start, *node;

start.next = NULL;
node = &start;

for (i = 0; i < number; i++) // how many strings
{
scanf("%s" , str);
node->next = (struct string *) malloc(sizeof (struct string));
node = node->next;
node->colour = str;
node->next = NULL;
}

>Hi? is anyone good at functions in C programming??

No, C programmers usually don't use functions. :-)

>say i need to implement a function dumpstring(),each call to
>dumpstring() will return a pointer to the next string in storage
>(starting with the first)

I recommend Prelude's option. More specific to Drako's code it would look like:

Code:

struct string *return_ptr_to_next_str (struct string *list_ptr)
{
    return list_ptr->next;
}

Note that automatically NULL is returned at the end of the list. As you can see from Drako's code, each time a new node is created, the next-pointer is NULL. So for the last node, the next-pointer is NULL.