<span style="font-size:18px;">using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
 
namespace 运算符 
{ 
 class Program 
 { 
  static void Main(string[] args) 
  { 
   int a = 26; 
   int b = 10; 
   int c; 
   c= a + b; 
   Console.WriteLine("自然表达式a+b的值为：{0}",a);//C#中的输出格式 
   Console.WriteLine("{0}+{1}={2}",a,b,a+b);//C#的输出格式 
   Console.WriteLine("自然表达式a+b的值为："+a);//在这里“+”起到字符的连接作用 
   Console.WriteLine("a+b的返回值类型: {0}",(a+b).GetType());//显示返回值c的数据类型 
   string str1 = "This is "; 
   string str2 = "a new string"; 
   Console.WriteLine(str1+str2);//在这里“+”起到字符串的连接作用 
   Console.ReadLine(); 
  } 
 } 
} 
</span> 

<span style="font-size:18px;">using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
 
namespace 运算符 
{ 
 class Program 
 { 
  static void Main(string[] args) 
  { 
   object a = 10; 
   if (a is bool) 
   { 
    Console.WriteLine("b是一个bool类型"); 
   } 
   else 
   { 
    Console.WriteLine("b不是一个bool类型"); 
   } 
   Console.ReadLine(); 
  } 
 } 
}</span> 

<span style="font-size:18px;">using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
 
namespace 运算符 
{ 
 class Program 
 { 
  static void Main(string[] args) 
  { 
   object[] nums=new object[3]; 
   nums[0] = "123"; 
   nums[1] = 456; 
   nums[2] = "字符串"; 
   for (int i = 0; i < nums.Length; i++)//遍历数组nums的所有元素 
   { 
    string s = nums[i] as string;//将对应的元素转换为字符串 
    Console.WriteLine("nums[{0}]:",i); 
    if (s!=null) 
    { 
     Console.WriteLine("'"+s+"'"); 
    } 
    else 
    { 
     Console.WriteLine("不是一个字符串"); 
    } 
   } 
   Console.ReadLine(); 
  } 
 } 
} 
</span> 

<span style="font-size:18px;">using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
 
namespace 运算符 
{ 
 class Program 
 { 
  static void Main(string[] args) 
  { 
   bool b1; 
   char char1 = 'c'; 
   char char2 = 'd'; 
   byte[] unicode1 = Encoding.Unicode.GetBytes(new char[] { char1 });//将字符c的Unicode转换成字符串 
   byte[] unicode2 = Encoding.Unicode.GetBytes(new char[] { char2 }); 
   Console.WriteLine("字符'c'的Unicode值为：{0}", unicode1[0]); 
   Console.WriteLine("字符'd'的Unicode值为：{0}", unicode2[0]); 
   b1 = char1 > char2; 
   Console.WriteLine("char1>char2值为：{0}",b1); 
   Console.ReadLine(); 
   Console.ReadLine(); 
  } 
 } 
}</span>