Conditional statement in c#

The statement that can be executed based on the condition in called conditional statement. The statement is a block of code.

They are following 2 types:

1. Conditional Branching

2. Conditional Looping 

Conditional Branching

They are also 2 types:

1. If statement

2. Switch statement

If statement – If statement is used to test whether or not a condition is met.

The example of the if statement is given below:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication5

{

    class Program

    {

        static void Main(string[] args)

        {

            int a, b;

            Console.WriteLine("Enter the number");

            a = Int32.Parse(Console.ReadLine());

            b = Int32.Parse(Console.ReadLine());

            if (a > b)

            {

                Console.WriteLine("a is greater");

            }

            else if (b > a)

            {

                Console.WriteLine("b is geater");

            }

            else

            {

                Console.WriteLine("Both are equal");

            }

            Console.ReadLine();

        }

    }

}

Switch Statement – switch statement is used to compare two logical expressions.

The example of the switch statement is given below:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Switch

{

    class Program

    {

        static void Main(string[] args)

        {

            int value = 5;

            switch (value)

            {

                case 1:

                    Console.WriteLine(1);

                    break;

                case 5:

                    Console.WriteLine(5);

                    break;

                default:

                    Console.WriteLine("you can choose correct value");

                    break;

            }

                    Console.ReadKey();

            }

        }

    }

Conditional loops – Conditional loops is divided into 4 categories

For Loop

While Loop

Do while Loop

Foreach Loop

Each loop contains following 3 features

Initialization – it sets the starting points of loops

Condition – it sets the ending points of loops

Iteration – it is used to set the forward or backward direction of loops

The example of the For Loop is given below:

Program to generate the factorial of a number using for loop:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication13

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            int a, fact;

            a = Int32.Parse(textBox1.Text);

            fact = 1;

            for (int i = 1; i <= a; i++)

            {

                fact = fact * i;

            }

            textBox2.Text = fact.ToString();

        }

    }

}

Output:

The example of the while loop is given below:

Program to generate the factorial of a number using while loop:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication13

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            int a, fact;

            a = Int32.Parse(textBox1.Text);

            fact = 1;

            int i = 1;

            while (i <= a)

            {

                fact = fact * i;

                i++;

            }

            textBox2.Text = fact.ToString();

        }

    }

}

Output:

The example of the do while loop is given below:

Program to generate the factorial of a number using do while loop:

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication13

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            int a, fact;

            a = Int32.Parse(textBox1.Text);

            fact = 1;

            int i = 1;

            do

            {

                fact = fact * i;

                i++;

            }

            while (i <= a);

            textBox2.Text = fact.ToString();

        }

    }

}

Output:

For each Loops – For each loop in c# executes a block of code on each element in array .The syntax of the for each loops is given below:

string[] days = { "Sunday", "Monday", "TuesDay"};

  foreach (string day in days)

  {

                  MessageBox.Show("The day is : " + day);

  }

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