Comparison Operators

Before diving into control structures, we need to understand some operators. The first set of operators we will look at are called Comparison Operators.

As expressed by the name, the comparison operators are used for comparing values. Following is a list of all the comparison operators:

Operator	Operation
==	Equal To
!=	Not Equal To
>	Greater Than
<	Less Than
>=	Greater Than or Equal To
<=	Less Than or Equal To

Using comparison operators we can create logical expressions that return logical values, such as true or false. For-example the expression 5 < 1 will output false as 5 is not greater than 1.

Note
We can directly put expressions in the Console.Write methods.

main


              123456789101112
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			Console.WriteLine(5 < 1); // Output: False
        }
    }
}

Following are some more examples of expressions formed using comparison operators:

main


              123456789101112131415161718
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			Console.WriteLine(1 == 2); // Output: False
			Console.WriteLine(2 == 2); // Output: True
			Console.WriteLine(5 < 10); // Output: True
			Console.WriteLine(5 < 5); // Output: False (5 is NOT less than 5)
			Console.WriteLine(5 <= 5); // Output: True
			Console.WriteLine(5 >= 5); // Output: True
			Console.WriteLine(7 != 9); // Output: True
        }
    }
}

We can also put variables in these expressions:

main


              123456789101112131415161718
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int value_1 = 7;
			int value_2 = 9;

			Console.WriteLine(value_1 == value_2); // Output: False
			Console.WriteLine(value_1 > value_2); // Output: False
			Console.WriteLine(value_1 < value_2); // Output: True
			Console.WriteLine(value_2 > 5); // Output: True
        }
    }
}

We can store the results of the logical expressions into bool variables since boolean variables can hold a value of true or false:

main


              12345678910111213141516
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int x = 5;
			int y = 7;

			bool result = x > y;
			Console.WriteLine(result); // Output: False
        }
    }
}

Everything was clear?

Section 3. Chapter 1