CSharp - Statement if statement

Introduction

An if statement executes a statement if a bool expression is true. For example:

if ( 1 < 2 )
    Console.WriteLine ("true");       // true

The statement can be a code block:

if ( 1 < 2 )
{
       Console.WriteLine ("true");
       Console.WriteLine ("Let's move on!");
}

else clause

An if statement can optionally have an else clause:

if (2 + 2 == 5)
       Console.WriteLine ("Does not compute");
else
       Console.WriteLine ("False");        // False

Within an else clause, you can nest another if statement:

if (2 + 2 == 5)
       Console.WriteLine ("Does not compute");
else
       if (2 + 2 == 4)
            Console.WriteLine ("Computes");    // Computes

Demo

using System;
class MainClass//from   w  w w  .  j a va2s.co  m
{
   public static void Main(string[] args)
   {

        if (2 + 2 == 5)
               Console.WriteLine ("Does not compute");
        else
               if (2 + 2 == 4)
                    Console.WriteLine ("Computes");    // Computes
    

   }
}

Result

Quiz

• What is the output: use brackets for your if-else blocks?

Exercise

• Write program to Use Not Equals Operator with If statement
• Write program to Check if a number is a positive number
• Write program to Check if user input is Odd or Even Numbers
• Write program to Get the Greater of Two Numbers
• Write program to check if user input is one of the allowed alternatives
• Write program to Check both user name and password
• Write program to check a set of possible values
• Write program to Get the Minimum of Three Numbers
• Write program to Output Spanish Day of Week
• Write program to throw a coin once and check if it is Head or Tail
• Write program to Play Rock-Scissors-Paper game

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