public static int NhapN(){
int n = int.Parse(Console.ReadLine());
public static double[] NhapMang(int n) {
for (int i = 0; i < n; i++) {
arr[i] = double.Parse(Console.ReadLine());
public static void Bai177(double[] arr, double x, double y) {
for (int i = 0; i < arr.Length; i++) {
if ((arr[i] >= x) && (arr[i] <= y)) {
Console.Write(arr[i] + " ");
public static void Main()
Console.Write("Nhap x:");
double x = double.Parse(Console.ReadLine());
Console.Write("Nhap y:");
double y = double.Parse(Console.ReadLine());