File -> structure

**Etdim** · 12-20-2007

I have a problem assigning value to a variable that is in a structure.

I think that's the row with the problem:

Code:

fscanf(fp, "&#37;s %d\n", h->name[c_names], h->age[c_names]);

Is this the rights way to assign string and int? &h->age[c_names] also doesn't work.

Also is r->price++; correct?

**Elysia** · 12-20-2007

I'm thinking it should look like:

Code:

fscanf(fp, "&#37;s %d\n", &h->name[c_names], &h->age[c_names]);

But I don't know since I don't know what types they are - how about showing your struct?
Also read this since you're using fscanf("%s", ...).

**Etdim** · 12-20-2007

Code:

struct person{
        char name[20][30];
        int age[20];
        };

I'm passing the pointer *h to the function and I want the read data to be stored in the structure. I've done typedef and I've defined "h".

**Elysia** · 12-20-2007

Then it should be:

Code:

fscanf(fp, "&#37;s %d\n", h->name[c_names], &h->age[c_names]);

Since name is a 2D-array, it will basically be a char**, so name[c_names] will be char*, so no & should be required.
But the age needs &, because age[c_names] will be int.

I assume price is of type int or some such inside a struct (which you dereference with ->), if so, then yes, that is correct.

**tabstop** · 12-20-2007

I always forget the precedence rules, so I practice defensive parenthesizing: &(h->age[cnames]). That should work. Of course, fscanf with %s isn't any good anyway.

As to r->price++, that will add 1 (or 1.0, or 1.0f) to the value of r->price. So provided r is a pointer, and price is a scalar (not an array) in the struct pointed to by r, everybody's happy.

**Elysia** · 12-20-2007

Originally Posted by tabstop

I always forget the precedence rules, so I practice defensive parenthesizing: &(h->age[cnames]). That should work.

h->age[c_names] should do fine.

Of course, fscanf with %s isn't any good anyway.

I do so agree.
Etdim: I hope you read that link I gave you.

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