HELP with structs that contain arrays

[koolrud]

new to this forum sorry if i did anything wrong just looking for some help.

im writing a program that reads in from a file a certain number of products and a certain number of months that those products were sold for.....ive created the following struct

typedef struct{
      int ID;
      char *name;
      float *unit_prices;
      int *units_sold;
}product;

void read_data(product info[], int *Num_Products, int *Months);
 /*this reads in the data from the file and assigns Num_Products and months 
its value which then dynamically creates space to hold the rest of the information from the file*/


int main(void)
{
   int Num_Products;   
   int Months;
 
   product *info;

   info = (product *) malloc(sizeof(product) * Num_Products);

   info->unit_prices = (float*) malloc(sizeof(float) * Months);
   /*this is were my problem is.....i figured this would create space         
  for months inside each struct that i create but i realized its only       
  creating space for unit_prices inside struct info[0] not the other  
  structs created thats when i tried to use a for statement*/

   for(index = 0; index < Num_Products;  index++)
   {
        for(index2 = 0; index2 < Months; index2++)
        { 
              (info + index) -> unit_prices[index2] = (float*)  
                  malloc(sizeof(float) * Months);
        }
    }

any hints or help on how i should approach this is greatly appricated thanks

[quzah]

Months is a pointer. You need to be dereferencing it, or simply don't use a pointer.

struct foo
{
    size_t s;
    int *someints;
};

...

struct foo *f;
size_t x;

f = malloc( sizeof *f ); /* allocate one structure... */
f->s = 10; /* We want 10 ints... */
f->someints = malloc( sizeof( *(f->someints) ) * f->s ); /* Allocate space for 10 ints... */

for( x = 0; x < f->size; x++ ) /* For each int... */
     f->someints[ x ] = (x + 1) * (x + 1); /* Fill it with something... */

That looks about right.


Quzah.