Csharp/CSharp Tutorial/Operator/Logical Relational Operators

Boolean logical AND operator

class MainClass
{
  public static void Main()
  {
    bool result;
    
    result = (1 == 1) && (2 > 1);
    System.Console.WriteLine("(1 == 1) && (2 > 1) is " + result);
    result = (1 == 1) && (2 < 1);
    System.Console.WriteLine("(1 == 1) && (2 < 1) is " + result);
  }
}

(1 == 1) && (2 > 1) is True
(1 == 1) && (2 < 1) is False

Boolean logical NOT operator

class MainClass
{
  public static void Main()
  {
    bool result;
    
    
    result = !(1 == 0);
    System.Console.WriteLine("!(1 == 0) is " + result);
    result = !(1 == 1);
    System.Console.WriteLine("!(1 == 1) is " + result);
  }
}

!(1 == 0) is True
!(1 == 1) is False

Boolean logical OR operator

class MainClass
{
  public static void Main()
  {
    bool result;
    
    
    result = (1 == 1) || (1 == 0);
    System.Console.WriteLine("(1 == 1) || (1 == 0) is " + result);
    result = (1 == 0) || (1 == 0);
    System.Console.WriteLine("(1 == 0) || (1 == 0) is " + result);
  }
}

(1 == 1) || (1 == 0) is True
(1 == 0) || (1 == 0) is False

false expressions for operators: ==, > and

class MainClass
{
  public static void Main()
  {
    bool result;
    
    result = 10 == 1;
    System.Console.WriteLine("10 == 1 is " + result);
    result = 10 < 1;
    System.Console.WriteLine("10 < 1 is " + result);
    result = 10 <= 1;
    System.Console.WriteLine("10 <= 1 is " + result);
  }
}

10 == 1 is False
10 < 1 is False
10 <= 1 is False

List of Boolean Operators

Operator                       Symbol
Equals                         ==
Not Equal                      !=
Less Than                      <
Greater Than                   >
And (Short Circuiting)         &&
Or (Short Circuiting)          ||
And                            &
Or                             |
Less Than or Equal             <=
Greater Than or Equal          >=
Logical XOR                    ^

Logical operators

Operator Meaning & AND | OR ^ XOR (exclusive OR) || Short-circuit OR && Short-circuit AND ! NOT p Q p & q p | q p ^ q !p False False False False False True True False False True True False False True False True True True True True True True False False

Logical operators with an if statement

class MainClass
{
  public static void Main()
  {
    int intValue = 1500;
    string stringValue = "closed";
    if ((intValue > 1000) && (stringValue == "closed"))
    {
      System.Console.WriteLine("and");
    }
  }
}

and

Relational Operators

The relational operators are as follows:

Operator Meaning == Equal to != Not equal to > Greater than < Less than >= Greater than or equal to <= Less than or equal to

using System;
class MainClass
{
  static void Main(string[] args)
  {
    int a = 10, b = 20, c = 30;
    if (a < 15 && b < 20)
      c = 10;
        Console.WriteLine(c);
    if (a < 15 || b < 20)
      c = 15;
        
        Console.WriteLine(c);
    if (!(a == 15))
      c = 25;
      
        Console.WriteLine(c);
  }
}

true expressions for operators: !=, >,

class MainClass
{
  public static void Main()
  {
    bool result;
    
    result = 10 != 1;
    System.Console.WriteLine("10 != 1 is " + result);
    result = 10 > 1;
    System.Console.WriteLine("10 > 1 is " + result);
    result = 10 >= 1;
    System.Console.WriteLine("10 >= 1 is " + result);
    int intValue1 = 10;
    int intValue2 = 1;
    result = intValue1 != intValue2;
    System.Console.WriteLine("intValue1 != intValue2 is " + result);
  }
}

10 != 1 is True
10 > 1 is True
10 >= 1 is True
intValue1 != intValue2 is True