Thread: Help with LISTS [Urgent]

Hello everyone. I've been all the day with a problem and I can't fix it. I hope you can help me.

I have a company which has different areas (for example: Marketing, Sales, etc.) and each area has different employees. Each employee has a name and an age (for example: John, 27)

This are my structs (I just can use this two)

Code:

typedef struct employee{
    char name[20];
    int age;
    struct employee* next;
    struct employee* nextAge;
}tEmployee;

typedef struct company{
    char area[10];
    tEmployee* first; // points to the first of each area
}tCompany;

I don't know how to do the first part of this problem (I suppose I can do the rest on my own). I have to ask for the information and put it in the program.

This is what I think I have to do:
- First, I ask how many areas has the company.
- I ask for memory of that amount of areas (I know I have to use a realloc, I use it a lot of times, but I don't know what to put in NULL so I can use realloc)
- Then, I ask which area has an employee. For example: Area 1 - 2 employees: John (27) and Louis (29)
- I look in the list for the last position so I put there the new node, like this:

Code:

while(company->first!=NULL)
    company->first=company->first->sig;

and then I put there the information.


If I only had 1 area, I could do:

Code:

void fillDataOneEmployee(tCompany **company)
{
    while(((*company)->first->next)!=NULL)
        (*company)->first=(*company)->first->next;
    printf("\nName: ");
    scanf("%s", ((*company)->first->name));
    printf("\nAge: ");
    scanf("%s", ((*company)->first->age));
    (*company)->first->next=NULL;
}

(this code is for 1 employee)


Then I have to do a lot of things with that but I think I can do that on my own.




Can you help me how to start the program, please?
Thanks!!!!!

First create a function to allocate and initialise an employee struct

Code:

tEmployee *newEmployee(char name, int age) {
  tEmployee *n = malloc(sizeof(*n));
  if ( n ) {
    // initialise every member
    strcpy(n->name,name);
    n->age = age;
    n->next = NULL;
  }
  return n;
}

Next, add to a list

Code:

tEmployee *add(tEmployee *head, tEmployee *node ) {
  node->next = head;
  return node;
}

Basically, you're trying to do too much in a single function with all those ->...->... lines.