C#中的string和object类

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

namespace lession3
{
class Program
{
static void Main(string[] args)
{
object x1 = 10;
object x2 = x1;
object x3 = "String";
object x4 = 'c';
//对于任何一个object变量，可以赋给任何类型的值

string s1 = "hello";
string s2 = "world";
string s3 = s1 + s2;//合并字符串
char c1 = s1[4];//访问单个字符，
Console.WriteLine(c1);
Console.WriteLine(s3);

string str = "hello";
Console.WriteLine(str == s1);//比较两个字符串是否相等

string str1 = "helloworld";
string str2 = @"helloworld";//逐字字符串常量
Console.WriteLine(str1 == str2);//返回true
string str3 = "hello\tworld";//输出:hello    world
string str4 = @"hello\tworld";//输出:hello\tworld
string str5 = "Jack say\"hello\" to you";//输出Jack say "hello" to you
string str6 = @"Jack say""hello"" to you";//输出Jack say "hello" to you
Console.WriteLine(str3);
Console.WriteLine(str4);
Console.WriteLine(str5);
Console.WriteLine(str6);
Console.ReadLine();
}
}
}