#include <stdio.h>
#include <stdlib.h>
int main()
{
    int n;
    double *arr;
    printf("Input number of elements:\n");
    scanf("%d", &n);
    arr = (double*)calloc(n, sizeof(double));
    for (int i = 0; i < n; i++)
    {
        printf("a[%d] = %lf\n",i,arr[i]);
    }
    for (int i = 0; i < n; i++)
    {
        printf("a[%d] = ",i);
        scanf("%lf", &arr[i]);
    }
    for (int i = 0; i < n; i++)
    {
        printf("a[%d] = %lf\n",i, arr[i]);
    }
    return 0;

}