Comparing strings for equality - CSharp Language Basics

CSharp examples for Language Basics:string

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Description

Comparing strings for equality

Demo Code



using System;/*from   w  ww.  j  a  v a2s.  com*/

class StringCompare
{
   static void Main()
   {
      var string1 = "hello";
      var string2 = "good bye";
      var string3 = "Happy Birthday";
      var string4 = "happy birthday";

      // output values of four strings
      Console.WriteLine($"string1 = \"{string1}\"" +
         $"\nstring2 = \"{string2}\"" +
         $"\nstring3 = \"{string3}\"" +
         $"\nstring4 = \"{string4}\"\n");

      // test for equality using Equals method
      if (string1.Equals("hello"))
      {
         Console.WriteLine("string1 equals \"hello\"");
      }
      else
      {
         Console.WriteLine("string1 does not equal \"hello\"");
      }

      // test for equality with ==
      if (string1 == "hello")
      {
         Console.WriteLine("string1 equals \"hello\"");
      }
      else
      {
         Console.WriteLine("string1 does not equal \"hello\"");
      }

      // test for equality comparing case
      if (string.Equals(string3, string4)) // static method
      {
         Console.WriteLine("string3 equals string4");
      }
      else
      {
         Console.WriteLine("string3 does not equal string4");
      }

      // test CompareTo
      Console.WriteLine($"\nstring1.CompareTo(string2) is {string1.CompareTo(string2)}");
      Console.WriteLine($"string2.CompareTo(string1) is {string2.CompareTo(string1)}");
      Console.WriteLine($"string1.CompareTo(string1) is {string1.CompareTo(string1)}");
      Console.WriteLine($"string3.CompareTo(string4) is {string3.CompareTo(string4)}");
      Console.WriteLine($"string4.CompareTo(string3) is {string4.CompareTo(string3)}");
   }
}

Result


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