C structure within structure problem, need help

I have a structure and within that structure, i have a declaration of a structure of type different structure. So im trying to store data through a function that only passed the artist type structure.

struct cd {
int cdnum;
int cdcount;
char cdtitle[80];
struct cd *next;
};

struct artist
char name[80];
struct cd *link;
};


so in a function i later write, a structure of type artist is passed by pointer. I want to store data into the "cd structure" portion of the artist structure.

this is what i thought would work:
scanf("%d", p->link.cdnum);

but it doesn't and im stumped. I still think it would work even though it wont compile :). can someone help me out?

heres the protype for that later function just incase:
void newcd(struct artist *p,int size);

> scanf("%d", p->link.cdnum);

Is "p" a pointer? If so:

&p->link->cdnum

If not:

&p.link->cdnum

Remember, scanf uses addresses. So, if the final variable you're trying to use is not a pointer, you must provide its address.

Quzah.

Thanks for the quick reply!

That didn't seem to work for me however :D (i do go now a little farther in the program before it crashes though : ) )

This is that function i wrote:

void newcd(struct artist *p, int size)

{
struct cd *tmp;
tmp = p->link;

printf("Artist name:\n");
gets(p->name);
puts (p->name);

printf("CD number:\n");
*scanf("%d", &tmp->cdnum);

printf("CD title:\n");
gets(p->link->cdtitle);

printf("The ammount to be stocked:\n");
scanf("%d", &p->link->cdcount);
}

My program now crashes right at the * i labeled. the printf line with "CD number" will show, and then i enter in a digit, hit return and it crashes.

> tmp = p->link;


> gets(p->link->cdtitle);

You never check to see if 'p->link' is NULL. Make sure you've allocated it, otherwise, this may be why your program tanks.

Quzah.

Same unregistered user as before, different question.

with the segment of code i have below, im trying to manipulate a structure with [100] elements to it.

int size=100;
struct artist artist_array[size];

how can i manipulate a different index inside a function that had this array passed through it? p[i]->name is not a valid way to use pointers is my guess.
Insight apreciated : ). and if anyone knows any good sites with pointers, that as well would be apreciated :))

void details(struct artist *p, int size)


{
char name[80];

int i = 0;
printf("Enter the artist name:\n");
gets(name);

while( i < 100)
{
if (name == p[i]->name)
{ printf("Artist: %s\n", p[i]->name);
printf("CD title: %s\n", p[i]->link->cdtitle);
printf("Stocked: %d\n", p[i]->link->cdcount);}
else i++;}
}

Try this:

Code:

---

void details(struct artist *p, int size){
        char name[80];
        int i = 0;

        printf("Enter the artist name:\n");
        fgets(name, sizeof(name), stdin);

        while( i < 100){
                if (strcmp(p[i].name, name) == NULL){
                        printf("Artist: %s\n", p[i].name);
                        printf("CD title: %s\n", p[i].link.cdtitle);
                        printf("Stocked: %d\n", p[i].link.cdcount);
                        break;
                }else{
                        i++;
                }
        }
}

---

p is an array of structures, so you access it like an array but you access it's members as if it were just a single structure, ie. with the dot operator

You also want to exit the loop upon finding what you were searching for to save processing time.

-Prelude