Test 3th

using System;
using System.Collections.Generic;
using System.Text;

namespace B_CIT09_111_DINHKIMTHACH_KT03
{

class Program

{
//Nhap chuoi
private static string nhap()
{
string ch;
ch=Console.ReadLine();
return ch;
}
//Tim chuoi ch2 trong ch1
private static int timchuoi(string in1,string in2)
{
int vitri;
vitri = in1.IndexOf(in2);
if (vitri > 0)
{
return 1;
}
else
return 0;
}
private static int demkt(string in1)
{
int soktu;
soktu = in1.Length;
return soktu;
}
//private static string thaykytu(string in1)
//{
// int vt = 0;
// string temp = "";
// foreach (char ty in in1)
// {
// if (ty != ' ')
// temp[vt] = ty;
// else
// temp[vt] = '@';
// vt++;
// }
//}

static void Main(string[] args)
{
string ch1,ch2,ch3;
int kq;
Console.Write("Cau 1 : Nhap chuoi ch1 :");
ch1 = nhap();
Console.WriteLine("---------------------------------------------");
Console.Write("Cau 2 : Nhap them chuoi ch2 : ");
ch2 = nhap();
Console.WriteLine("Ket qua : ");
kq=timchuoi(ch1,ch2);
if (kq==0)
Console.WriteLine("chuoi ch2 khong ton tai trong ch1");
else
Console.WriteLine("chuoi ch2 ton tai trong ch1");
Console.WriteLine("---------------------------------------------");
Console.WriteLine("Cau 3 :Dem so ky tu trong chuoi ch3 : ");
Console.Write("Nhap ch3 : ");
ch3 = nhap();
int skt;
skt = demkt(ch3);
Console.WriteLine("Ket qua : {0}", skt);
Console.ReadLine();
}
}
}