Day 9 || if Statement || else if Statement || Switch in JavaScript

 JavaScript Topics  

Day 9 :

Conditional statements:

    1. if Statement

    2. else Statement

    3. else if Statement

    4. Switch

Conditional statements:

    1. if Statement  and 2. else Statement:

var userAge = 10;

if (userAge >= 18) {

  console.log("Welcome! You can open the website.");

} else {

  console.log("Sorry, you are not old enough to open the website.");

}

// Ticket booking

var totalSeatsInTheater = 100;

var bookedSeatsInTheater = 70;

var availableSeatsInTheater = totalSeatsInTheater - bookedSeatsInTheater;

if (availableSeatsInTheater > 0) {

  console.log("We have " + availableSeatsInTheater + " seats available.");

  var numOfTicketsBooking = 2;

  if (numOfTicketsBooking <= availableSeatsInTheater) {

    console.log("Booking " + numOfTicketsBooking + " tickets...");

  } else {

    console.log("Sorry, there are not enough seats available.");

  }

} else {

  console.log("Sorry, the theater is fully booked.");

}

3. else if Statement:

var examScore = 45;

if (examScore >= 90) {

  grade = "A";

} else if (examScore >= 80) {

  grade = "B";

} else if (examScore >= 70) {

  grade = "C";

} else if (examScore >= 50) {

  grade = "D";

} else {

  grade = "F";

}

console.log("Your grade is:" + grade);

4. Switch

var teaOrder = "jasmineTea";

switch (teaOrder) {

  case "Chai":

    message = "Chai ordered";

    break;

  case "jasmineTea":

    message = "jasmineTea ordered";

    break;

    default:

        message = "Not Available "

}

console.log(message);

Task 1: Check if a Number is Even or Odd Write a JavaScript program that takes a number as input and displays whether it's even or odd. Task 2: Determine the Greater Number Write a JavaScript program that takes two numbers as input and displays which one is greater (or if they are equal). Task 3: Check if a Number is Positive, Negative, or Zero Write a JavaScript program that takes a number as input and displays whether it's positive, negative, or zero.

Interview Questions: 1. What is the difference between switch and if...else if...else when it comes to handling multiple conditions? 2. What is the purpose of the break statement in a switch statement? 3. How do you use the else if statement in JavaScript? Provide a code example.