Thread: Auto generated ID V2

I need help understand that code

Auto generated ID

Code:

int nextid ( ) {
static int last = 0;
return ++last;
}

Code:

struct ANIMAL {
    char especie[MAX]; // ID from specie
    int id; // ID Animal        
    char nome[MAX]; // Name of the animal
    int peso; // Weight
    char nomelocal[MAX]; // Place where the animal live
    pno prox; // Pointer for the next 


};

What i want to do is the following, i am loading animals from a text file each one i want to have a diferent ID.
(Run two diferent files one after the other and got OK)


Or in the middle of the program i want to make a baby animal and give him a automatic ID. ( Dind´t try it yet, still need to build function)

I think that code will ok, but first i don't fully understand with.

But after that part of ID i want it to remember the species.

Monkey: 1
Monkey: 2
Lion: 1
Zebra: 1
Monkey: 3
Snake: 1

How can i approach my problem ?

With the code you posted, you would get
Monkey: 1
Monkey: 2
Lion: 3
Zebra: 4
Monkey: 5
Snake: 6

The ID is globally unique for all your animal records, regardless of species.

If you want a per-species ID, then you need to store a separate record of

Code:

struct idgen {
  char especie[MAX];
  int nextId;
};
int nextid ( char especie[MAX] ) {
  /// perform some kind of lookup
}

Originally Posted by algorism

It seems that you just want separate counts of the different species, using the current count as the id for an individual. But with sentences like "I think that code will ok, but first i don't fully understand with", it's hard to tell what you want.

That was because i dind´t know static int, now i do because of the forum. Thanks

C static variable example - YouTube


I already upgraded a little bit the generator, because if i close the program and open again the counter will return back to 0.

Now i read the last value from one file and write after i increment it.


Now i need the v3

I want a alphanumeric generator. (Still thinking about the format i want, i just know that need to be alphanumeric )

ID Specie: monkey2: SerialNumber: 1
ID Specie: 4pig: SerialNumber: 1
ID Specie: monkey2: SerialNumber: 2
ID Specie: monkey2: SerialNumber: 3

I will store the information on a linked list or variable length array.


Sorry for my poor english.