ex-10-02

Programming Csharp Source Code(代码) Programming Csharp Source Code

// Example 10-02: Using the Substring() method

namespace Programming_CSharp
{
   using System;
   using System.Text;
    
   public class StringTester
   {
      static void Main()
      {
         // create some strings to work with
         string s1 = "One Two Three Four"; 

         int ix;

          // get the index of the last space
         ix=s1.LastIndexOf(" ");
            
         // get the last word.
         string s2 = s1.Substring(ix+1); 
            
         // set s1 to the substring starting at 0
         // and ending at ix (the start of the last word
         // thus s1 has one two three
         s1 = s1.Substring(0,ix);    
       
         // find the last space in s1 (after two)
         ix = s1.LastIndexOf(" ");

         // set s3 to the substring starting at 
         // ix, the space after "two" plus one more
         // thus s3 = "three"
         string s3 = s1.Substring(ix+1);

         // reset s1 to the substring starting at 0
         // and ending at ix, thus the string "one two"
         s1 = s1.Substring(0,ix);

         // reset ix to the space between 
         // "one" and "two"
         ix = s1.LastIndexOf(" ");

         // set s4 to the substring starting one
         // space after ix, thus the substring "two"
         string s4 = s1.Substring(ix+1);

         // reset s1 to the substring starting at 0
         // and ending at ix, thus "one"
         s1 = s1.Substring(0,ix);

         // set ix to the last space, but there is 
         // none so ix now = -1
         ix = s1.LastIndexOf(" ");

         // set s5 to the substring at one past
         // the last space. there was no last space
         // so this sets s5 to the substring starting
         // at zero
         string s5 = s1.Substring(ix+1);
            
         Console.WriteLine ("s2: {0}\ns3: {1}",s2,s3);
         Console.WriteLine ("s4: {0}\ns5: {1}\n",s4,s5);
         Console.WriteLine ("s1: {0}\n",s1);

      }
   }
}