// Pantea Aria

// Example: creating a dynamic array with malloc
// then growing it later using realloc


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

// TODO: write a function that creates and returns
// a malloced array of given size
int *build_array(int size);

// TODO: write a function to print an array
void show_array(int array[], int size);

int main(void) {
    int size;
    printf("Enter initial size: ");
    scanf("%d", &size);

    // TODO: call build_array and check for NULL
    int *numbers = build_array(size);
    int i = 0;
    while (i < size) {
        numbers[i] = i * 2;   //or any other value you want
        i++;
    }
    // TODO: print the original array
    show_array(numbers, size);

    // We decide the array needs to grow
    int new_size = size + 1;

    // TODO: use a temporary pointer with realloc
    int *temp = realloc(numbers, new_size * sizeof(int));

    // TODO: check if realloc failed
    // if successful, update numbers
    if (temp != NULL) {
        numbers = temp;
    } else {
        printf("ERROR in realloc");
        free(numbers);
        return 1;
    }

    // TODO: assign a value to the new element
    numbers[new_size - 1] = 99;

    // TODO: print the resized array
    show_array(numbers, new_size);
    free(numbers);

    // TODO: free the memory
    return 0;
}
int *build_array(int size) {
    int *p = malloc(size * sizeof(int));
    return p;
}
void show_array(int numbers[], int size) {
    for (int i = 0; i < size; i++) {
        printf("%d ", numbers[i]);
    }
    printf ("\n");
}