Lesson 2 – Data Types in C#

In the last lesson, you saw how to set up the C# environment and how to install your first C# program. In this lesson, you will study the concept of data types and variables in C#. A variable is basically placeholder that is used to store data of a particular data type. A variable points to the memory location where the actual data is stored.

C# datatypes can be broadly categorized into four types:

1. Numeric
2. Boolean
3. String
4. Char

Numeric Data Type

Numeric data types in C# are used to store numeric data. The following table shows commonly used numeric data types supported by C#:

Let’s now see a very simple example that uses some of these numeric operators:

using System;

namespace C_Project
{
    class Program
    {
        static void Main(string[] args)
        {
            int number1 = 100;
            int number2 = 50;

            float number3 = 50.56F;
            float number4 = 50.62F;

            Console.WriteLine(number1 + number2);
            Console.WriteLine(number3 + number4);
        }
    }
}

In the script above, we declare two integer variables number1 and number2 which store integer type data 100 and 50. Similarly, we declare two floating variables number3 and number4 with values 50.56F and 50.62F respectively. Next, we add variable number1 with number2 and the variable number3 with number4. Finally, we display the result of the addition on the console. The output looks like this:

150
101.18

Boolean Data

The boolean data type is used to store boolean data. In C#, the word “bool” is used to store boolean data. A “bool” type variable can have two values: True or False. The following example will further clarify the use of the boolean variable.

using System;

namespace C_Project
{
    class Program
    {
        static void Main(string[] args)
        {
            bool sick = false;

            Console.WriteLine("Are you sick?: Anser =" + false);
        }
    }
}

using System;

namespace C_Project
{
    class Program
    {
        static void Main(string[] args)
        {
            string message1 = "Welcome to Dronaschool.com";
            Console.WriteLine(message1);
        }
    }
}

Welcome to Dronaschool.com

using System;

namespace C_Project
{
    class Program
    {
        static void Main(string[] args)
        {
            char a = 'a';
            Console.WriteLine(a);
        }
    }
}