Mã:

//Nhap vao ten sinh vien:
//xuat ra ho, ten
//dem ten co bao nhieu tu
//in nguoc ten ra man hinh
using System;
using System.Collections.Generic;
using System.Text;

namespace Chuoi
{
    class Program
    {
        static void Main(string[] args)
        {
            //tao string sv1 de nhap ten sv vao
            string sv1;
            Console.WriteLine("Moi nhap ho ten sinh vien: ");
            sv1 = Console.ReadLine();
            //lay do dai cua chuoi ten sinh vien vua nhap
            int n= sv1.Length;
            //ta Ho cua sinh vien duoc ket thuc bang khoang trang
            //vi vay dem do dai cua Ho tu` dau` den khoang trang gan nhat
            int x = sv1.IndexOf(" ");
            //ta thay Ten cua sinh vien la ky tu cuoi cung, phan 
            //biet voi cac ky tu khac bang khoang trang cuoi cung
            //nen dung ham lastindexof de dem so ky tu tu dau den het khoang trang cuoi cung
            // roi lay do dai cua chuoi tru cho gia tri lastindexof se ra do dai cua ten
            int y = sv1.LastIndexOf(" ");
            //tach ten o vi tri y (khoang trang cuoi cung ) voi do dai la n-y (do dai cua ten)
            string ten = sv1.Substring(y, n - y);
            //tach ho o vi tri dau tien voi do dai la x (do dai cua ho)
            string ho = sv1.Substring(0, x);
            //tach tung tu trong ho ten sinh vien va dua vao mang
            char dau = char.Parse(" ");
            string[] mang1 = new string[100];
            mang1 = sv1.Split(dau);
            //dem so ky tu cua mang 
            int dodai = mang1.Length;
            //xuat ten, ho, dem so tu
            Console.WriteLine("Ten: {0}",ten);
            Console.WriteLine("Ho: {0}", ho);
            Console.WriteLine("Tong so tu la: {0}",dodai);
            //xuat nguoc
            for (int i = dodai -1; i >= 0; i--)
                Console.WriteLine(mang1[i]);
            Console.ReadLine();
        }
    }
}