C - Pointer To Structure

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define N 20

struct data{
    int age;
    struct data *nextAge;
};

int main()
{
    system("color 2f");

    struct data zero, satu, dua, tiga;
    zero.age = 24;

    struct data* ptr;
    ptr = &zero;

    (*ptr).age = 24;

    printf("%d\n", zero.age);
    printf("%d\n", (*ptr).age);
    printf("%d\n", ptr->age);

    return 0;
}

C - Pointer To Structure