#include <stdio.h>
#include <stdlib.h>
 
// core data structure
struct Point
{
    float x;
    float y;
    float z;
};
 
// function that allocates space for our array and fills it with dummy values
void fill_xyz_list(struct Point **xyz_list_ptr, int list_size)
{
    // allocate memory for 100 Point structs
    *xyz_list_ptr = realloc(*xyz_list_ptr, sizeof(struct Point)*list_size);
 
    // set values for each member
    int i;
    for (i=0; i<list_size; i++)
    {
        (*xyz_list_ptr)[i].x = i + 0.1;
        (*xyz_list_ptr)[i].y = i + 0.2;
        (*xyz_list_ptr)[i].z = i + 0.3;
    }
}
 
int main()
{
    struct Point *xyz_list = NULL; // our array of (x, y, z)
    int list_size; // our array size
    int i;
 
    // set list size
    list_size = 10;
 
    // fill xyz_list array with dummy values
    fill_xyz_list(&xyz_list, list_size);
 
    // print all members
    for (i=0; i<list_size; i++)
    {
        printf("xyz_list[%d]: x=%.2f, y=%.2f, z=%.2f\n", i, xyz_list[i].x, xyz_list[i].y, xyz_list[i].z);
    }
 
    return 0;
}
 

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