C# - Relational Operators

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Following table shows all the relational operators supported by C#. Assume variable A holds 10 and variable B holds 20, then:

OperatorDescriptionExample
== Checks if the values of two operands are equal or not, if yes then condition becomes true. (A == B) is not true.
!= Checks if the values of two operands are equal or not, if values are not equal then condition becomes true. (A != B) is true.
> Checks if the value of left operand is greater than the value of right operand, if yes then condition becomes true. (A > B) is not true.
< Checks if the value of left operand is less than the value of right operand, if yes then condition becomes true. (A < B) is true.
>= Checks if the value of left operand is greater than or equal to the value of right operand, if yes then condition becomes true. (A >= B) is not true.
<= Checks if the value of left operand is less than or equal to the value of right operand, if yes then condition becomes true. (A <= B) is true.

Example

Try the following example to understand all the relational operators available in C#:

using System;

class Program
{
  static void Main(string[] args)
  {
      int a = 21;
      int b = 10;
      
      if (a == b)
      {
          Console.WriteLine("Line 1 - a is equal to b");
      }
      else
      {
          Console.WriteLine("Line 1 - a is not equal to b");
      }
      if (a < b)
      {
          Console.WriteLine("Line 2 - a is less than b");
      }
      else
      {
          Console.WriteLine("Line 2 - a is not less than b");
      }
      if (a > b)
      {
          Console.WriteLine("Line 3 - a is greater than b");
      }
      else
      {
          Console.WriteLine("Line 3 - a is not greater than b");
      }
      /* Lets change value of a and b */
      a = 5;
      b = 20;
      if (a <= b)
      {
         Console.WriteLine("Line 4 - a is either less than or equal to  b");
      }
      if (b >= a)
      {
         Console.WriteLine("Line 5-b is either greater than or equal to b");
      }
  }
}

When the above code is compiled and executed, it produces the following result:

Line 1 - a is not equal to b
Line 2 - a is not less than b
Line 3 - a is greater than b
Line 4 - a is either less than or equal to b
Line 5 - b is either greater than or equal to b


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