C#: if, else : Conditional statements

C# provides control flow statements for decision making.

Decision making statements

if statement

“if” statement execute the section of code when the condition evaluates to true.

Syntax

if(condition){

// Executes if the condition true

}

Program.cs

using System;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Please Enter Your Marks");

        int marks = int.Parse(Console.ReadLine());

        if (marks < 35)
        {
            Console.WriteLine("You failed in the Exam. Better luck next time");
        }

        if(marks >= 35)
        {
            Console.WriteLine("Congrats, you passed in the Exam");
        }
    }
}

Sample Output1

Please Enter Your Marks

85

Congrats, you passed in the Exam

Sample Output2

Please Enter Your Marks

20

You failed in the Exam. Better luck next time

if-else statement

Syntax:

    if(condition){

    }

    else{

    }

If the condition true, then if block code executed, otherwise else block code executed.

Program.cs

using System;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Please Enter Your Marks");

        int marks = int.Parse(Console.ReadLine());

        if (marks < 35)
        {
            Console.WriteLine("You failed in the Exam. Better luck next time");
        }
        else
        {
            Console.WriteLine("Congrats, you passed in the Exam");
        }
    }
}

Sample Output1

Please Enter Your Marks

85

Congrats, you passed in the Exam

Sample Output2

Please Enter Your Marks

20

You failed in the Exam. Better luck next time

if-else if-else ladder

By using if-else if-else construct, you can choose number of alternatives.

An if statement can be followed by an optional else if...else statement, which is very useful to test various conditions.

Program.cs

using System;

class Program
{
    static void Main(string[] args)
    {
        Console.WriteLine("Please Enter Your Marks");

        int marks = int.Parse(Console.ReadLine());

        if (marks < 35)
        {
            Console.WriteLine("You are failed");
        }     
        else if (marks < 50)
        {
            Console.WriteLine("You are passed and got third class");
        }  
        else if (marks < 60)
        {
            Console.WriteLine("You are passed and got second class");
        }    
        else if (marks < 70)
        {
            Console.WriteLine("You are passed and got first class");
        }
        else
        {
           Console.WriteLine("You are passed and got distinction");
        }

           
    }
}

Sample Output1

Please Enter Your Marks

20

You are failed

Sample Output2

Please Enter Your Marks

40

You are passed and got third class

Sample Output3

Please Enter Your Marks

60

You are passed and got first class

Sample Output4

Please Enter Your Marks

80

You are passed and got distinction

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