app.js

                                                  //   CHAPTER # 1
// TASK # 1

// alert("Hello there,Greetings.");



// TASK # 2

// alert("Error! Please enter a valid password.")




// TASK # 3

// alert("Welcome to JS Land..." + "<break>" + "Happy Coding!");



// TASK # 4

// alert("Welcome to JS Land..");
// alert("Happy Coding!")



// TASK # 5

// Done in console


// alert("Hello ..I can run JS through my web browser's console");   



// Task # 6

// made use of alert in html project


// Task # 7

// Practiced all the 4 possible placement of <script> tag in my Project.






                                                     //    CHAPTER  # 2 

// TASK # 1

// var username;


// TASK # 2 

// var myName = "Syed Faizan Qaiser"



// TASK # 3

// var message = "Hello World"
// alert(message);


// TASK # 4

// var stName = "Jhone Doe"
// var stAge = "15 years old"
// var stCourse = "Certified Mobile Application Development"
// alert(stName);
// alert(stAge);
// alert(stCourse);


// TASK # 5

// var xyz = "PIZZA"

// alert(xyz + "\n" + xyz.slice(0,4)  + "\n" + xyz.slice(0,3) + "\n" + xyz.slice(0,2) + "\n" + xyz.slice(0,1) + "\n")



// TASK # 6

// var email = "faizee_20@hotmail.com"
// alert("My email address is " + email)



// TASK # 7

// var book = "A smarter way to learn JavaScript"
// alert("I am trying to learn from the book " + book)


// TASK # 8

// document.write("Yah! I can write HTML content through Javascript");


// TASK # 9 

// var xyz = "▬▬▬▬▬▬▬▬▬ஜ۩۞۩ஜ▬▬▬▬▬▬▬▬▬"
// alert(xyz);
// document.write(xyz)




                                                        //  CHAPTER  # 3

// Task # 1

// var age = 19;
// alert("I am " + age + " years old.");


// TASK # 2

// var visits = 15;
// alert("You have visited this site " + visits + " times");


// TASK # 3

// var birthYear = 2000;
// document.write("My Birthyear is " + birthYear + "<br>" + "Data type of my declared variable is " + typeof(birthYear)); 


// TASK # 4

// var visitorName = prompt("Enter your Name");
// var productTitle = prompt("Enter Product Name");
// var productQuantity = prompt("Enter quantity of product");
// document.write(visitorName + " ordered " + productQuantity +" "+ productTitle + " on XYZ Clothing Store");


                                                  // CHAPTER  # 4

// TASK # 1                                            
// var xyz , helloWorld , Zoo ;

// TASK # 2

// LEGAL variable names

// var Alpha;
// var betaAlpha;
// var gamma$;
// var fav_game;
// var player101;

//                                       // Illegal variable names

// var al pha;
// var aplha^;
// var alert;
// var 12;
// var fav orite;


// TASK # 3


// document.write("<h1>Rules for Naming JS variables</h1>");
// document.write("Variable names can only contain numbers,$,and _.For example $my_1stVariable"+"<br>");
// document.write("Variables must begin with a letter, $ or _. For example $name, _name or name" +"<br>");
// document.write("Variable names are case sensitive" +"<br>");
// document.write("Variable names should not be JS" +"<br>");


                                                 // CHAPTER  # 5

// TASK # 1

// var a = prompt("Enter first number");
// var num2 = prompt("Enter second number");
// var addition =  a) + (num2);
// document.write("Sum of " + a + " and " + num2 + " is " + addition);


// TASK # 2

// Subtraction

// var a = prompt("Enter first number");
// var num2 = prompt("Enter second number");
// var Subtraction =  a) - (num2);
// document.write a + " minus " + num2 + " yields " + Subtraction);

// Division

// var a = prompt("Enter first number");
// var num2 = prompt("Enter second number");
// var division = a / num2;
// document.write a + " divided by " + num2 + " yields " + division);   


// MULTIPLICATION

// var a = prompt("Enter first number");
// var num2 = prompt("Enter second number");
// var multiplication = a * num2;
// document.write a + " multiplied by " + num2 + " yields " + multiplication);


// MODULUS

// var a = prompt("Enter first number");
// var num2 = prompt("Enter second number");
// var remainder = a  % num2;
// document.write("The division remainder for "  a+ " divided by " +num2+ " is " +remainder);


// TASK # 3

// var alpha;
// document.write("Value after variable declaration is: ?? <br>");
// alpha = 5;
// document.write("Initial value:" + alpha + "<br>");
// alpha=alpha+1;
// document.write("Value after increment is " + alpha + "<br>");
// alpha=alpha+7;
// document.write("Value after addition is " + alpha + "<br>");
// alpha=alpha-1;
// document.write("Value after decrement is " + alpha + "<br>");
// remainder = alpha % 3;
// document.write("The remainder is " +remainder + "<br>");


// TASK # 4

// var cost_of_movieticket = 600;
// var totalcostof_five_tickets = 600*5;
// document.write("Total Cost to buy 5 tickets to a movie is " +totalcostof_five_tickets);



// TASK # 5

// var num = 4;
// for(var i=1 ; i<=10 ; i++){
//     var ans = num * i;
//     document.write("4 x " +i+ " = " +ans + "<br>");
// }


// TASK # 6

// var celsius_temp = 57;
// var fahrenheit_temp = 105;
// celsius_conv = (fahrenheit_temp - 32)*5/9;
// fahrenheit_conv = (celsius_temp*9/5) + 32;
// document.write(celsius_temp + "o".sup() + "C is " + fahrenheit_conv.toFixed(2) + "o".sup() + "F <br>");
// document.write(fahrenheit_temp + "o".sup() + "F is " + celsius_conv.toFixed(2) + "o".sup() + "C");


// TASK # 7

// var price_item1 = 400;
// var price_item2 = 600;
// var quantity_item1 = 3;
// var quantity_item2 = 2;
// var shipping_rate = 500;
// var total_charges = (price_item1*quantity_item1) + (price_item2*quantity_item2) + shipping_rate;
// document.write("Price of item 1 is " + price_item1 + "<br>");
// document.write("Quantity of item 1 is " + quantity_item1 + "<br>");
// document.write("Price of item 2 is " + price_item2 + "<br>");
// document.write("Quantity of item 2 is " + quantity_item2 + "<br>");
// document.write("Shipping Charges are : " +shipping_rate + "<br>");
// document.write("Total Cost of your order is " + total_charges + "<br>");


// TASK # 8

// var total_marks = 500;
// var marks_obtained = 358;
// var percentage_obt = (marks_obtained * 100) / total_marks ;
// document.write("<h1>Marks Sheet </h1> <br>" + "Total Marks: " + total_marks + "<br>" + "Marks Obtained: " + marks_obtained + "<br>" + "Percentage: " + percentage_obt);



// TASK # 9

// var USD_quantity = 10;
// var RIYAL_quantity = 25;
// var USD_rate = 104.80;
// var RIYAL_rate = 28;
// var total_currency_in_pkr = (USD_quantity*USD_rate) + (RIYAL_quantity*RIYAL_rate);
// document.write("<h1>Curreny In PKR </h1> <br> Total Currency in PKR: " + total_currency_in_pkr );


// TASK # 10

// var abc = 3;
// var calculation_on_abc = ((abc + 5) * 10) / 2;
// document.write(calculation_on_abc);


// TASK # 11

// var birth_year = prompt("Enter the Year in which you were born.")
// var current_year = 2020;
// var age = current_year - birth_year;
// document.write("Current Year: " +current_year + "<br>");
// document.write("Birth Year: " + birth_year + "<br>");
// document.write("Your Age is: " + age + "<br>");


// TASK # 12

// document.write("<h1>The Geometrizer</h1>");
// var radius_circle = prompt("Enter Radius of circle: ");
// var circumference = 2 * 3.142 * radius_circle;
// var area = 3.142 * (radius_circle * radius_circle);
// document.write("Radius of a Circle: " + radius_circle + "<br>");
// document.write("The Circumference is: " + circumference + "<br>");
// document.write("The Area is: " + area + "<br>");


// TASK # 13

// var fav_snack = "FrenchFries";
// var current_age = 19;
// var max_age = 65;
// var estimated_amount_perday = 2;
// var total_snack = (60 - 19)*(365*2);
// document.write("<h1>The Lifetime Supply Calculator</h1> <br>");
// document.write("Favorite Snack: " + fav_snack + "<br>");
// document.write("Current Age: " + current_age + "<br>");
// document.write("Estimated Current Age: " + max_age + "<br>");
// document.write("Amount of Snacks Per Day: " + estimated_amount_perday + "<br>");
// document.write("You will need " + total_snack + " " + fav_snack + " to last you until the ripe old age of " + max_age);



                                             //  CHAPTER  # 6 - 9

// TASK # 1


// var a = prompt("Enter a number");
// document.write("<h3>Result:</h3>");
// document.write("The value of a is: " + a +"<br>");

// document.write("The value of ++a is: " + ++a + "<br> The value of a is: " + a + "<br> The value of a++ is: " + a++ + "<br>The value of a is: " + a + "<br> The value of --a is: " + --a + "<br> The value of a is: " + a + "<br> The value of a-- is: " + a--  + "<br> The value of a is: " + a);



// TASK # 2


// var a = 2, b = 1;
// var result = (--a) - (--b) + (++b) + (b--);
// document.write("a is: " + a + "<br>");
// document.write("b is: " + b + "<br>");
// document.write("result is: " + result + "<br>");

// Explanation:

// --a;  pre-decrement(at this stage the value of a which was 2 is predecremented means it is subtracted first which gives a=1)
// --a - --b;   at this stage b=1 is pre-decremented which means it holds value b=0 .The result is (1-0 = 1)
// --a - --b + ++b;  previously b holds the value b=0 which is pre-incremented in the next part which means that b=1 now.
// The result is (1+1=2)

// --a - --b + ++b + b--;  at this stage b holds value b=1 which due to post decrement returns value b=1.
// The Result is (2+1=3)
// The overall eq is (1+1+1 = 3)




// TASK # 3

// var name = prompt("Enter your name: ");
// alert("Greetings to you," +name );


// TASK # 4

// var table_no = prompt("Enter Number for multiplication table: ");
// for (var i = 1; i <= 10; i++) {
//     var multiplication_val = table_no * i;
//     document.write(table_no + " x " + i + " = " + multiplication_val + "<br>");


// }
// document.write("<br>");

// var table_no_2 = prompt("Enter 2nd Number for multiplication table: ");
// if (table_no_2 == table_no) {
//     table_no_2 = 5;
// }
// for (var z = 1; z <= 10; z++) {
//     var multiplication_val_2 = table_no_2 * z;
//     document.write(table_no_2 + " x " + z + " = " + multiplication_val_2 + "<br>");
// }



// TASK # 5



// var sub_one = prompt("Enter Subject 1: ");
// var sub_two = prompt("Enter Subject 2: ");
// var sub_three = prompt("Enter Subject 3: ");
// var marks_sub_one = prompt("Enter Subject 1 Marks: ");
// var marks_sub_two = prompt("Enter Subject 2 Marks: ");
// var marks_sub_three = prompt("Enter Subject 3 Marks: ");
// var max_marks = 100;
// var total_max_marks = 300;
// var total_gained_marks = marks_sub_one + marks_sub_two + marks_sub_three;
// var total_percent = (total_gained_marks * 100) / total_max_marks;

// document.write("<h4>Subject Total Marks ObtainedMarks Percentage</h4>");
// document.write(sub_one + " " + max_marks + " " + marks_sub_one + " " + marks_sub_one+"% <br>");
// document.write(sub_two + " " + max_marks + " " + marks_sub_two + " " + marks_sub_two+"% <br>");
// document.write(sub_three + " " + max_marks + " " + marks_sub_three + " " + marks_sub_three+"% <br>");
// document.write(' ' + total_max_marks + ' ' + total_gained_marks + ' ' + total_percent+'%' );



                                               // CHAPTER # 9 - 11

// TASK # 1

// var city_name = prompt("Enter a city: ");
// var city = city_name.toLowerCase();
// if (city == "karachi"){
//     document.write("Welcome to the city of lights!");
// }


// TASK # 2


// var gender = prompt("What is your gender?");
// var gender_tolowercase = gender.toLowerCase();
// if(gender_tolowercase == "male"){
//     document.write(" Good Morning Sir.")
// }
// else if(gender_tolowercase == "female"){
//     document.write(" Good Morning Ma'am.")
// }




// TASK # 3

// var color = prompt("Enter color of traffic signal");
// color = color.toLowerCase();
// if(color == "red"){
//     document.write("Must Stop")
// }
// else if(color == "yellow"){
//     document.write("Ready to move")
// }
// else if(color == "green"){
//     document.write("Move now")
// }
// else{
//     document.write("Please specify the correct color");
// }


// TASK # 4

// var remaining_fuel = prompt("Enter remaining fuel in litres");
// if(remaining_fuel < 0.25){
//     document.write("Plz refill the fuel in your car");
// }



// TASK # 5
// part a)
// var a = 4;
// if (++a === 5){
// alert("given condition for variable a is true");
// }

// part b)
// var b = 82;
// if (b++ === 83){
// alert("given condition for variable b is true");
// }

// part c)
// var c = 12;
// if (c++ === 13){
// alert("condition 1 is true");
// }
// if (c === 13){
// alert("condition 2 is true");
// }
// if (++c < 14){
// alert("condition 3 is true");
// }
// if(c === 14){
// alert("condition 4 is true");
// }

// part d)
// var materialCost = 20000;
// var laborCost = 2000;
// var totalCost = materialCost + laborCost;
// if (totalCost === laborCost + materialCost){
// alert("The cost equals");
// }

// part e)
// if (true){
//     alert("True");
//     }
//     if (false){
//     alert("False");
//     }

// part f)

// if("car" < "cat"){
//     alert("car is smaller than cat");
//     }


// TASK # 6

// var sub1_marks = prompt("Enter Marks for subject 1");
// var sub2_marks = prompt("Enter Marks for subject 2");
// var sub3_marks = prompt("Enter Marks for subject 3");
// var total_marks = prompt("Enter total marks");
// var total_obtained_marks = (sub1_marks) + (sub2_marks) + (sub3_marks);
// var percent_marks = (total_obtained_marks*100) / (total_marks);
// document.write("<h2>Marksheet</h2>")
// document.write("Total Marks: " + (total_marks) +   "<br>");
// document.write("Marks Obtained: " + total_obtained_marks +   '<br>');
// document.write("Percentage: " + percent_marks.toFixed(2) +   "<br>");
// if(percent_marks >= 80){
//     document.write("Grade : A-one <br>");
//     document.write("Remarks : Excellent")
// }
// else if(percent_marks >= 70){
//     document.write("Grade : A <br>");
//     document.write("Remarks : Good");
// }
// else if(percent_marks >= 60){
//     document.write("Grade : B <br>");
//     document.write("Remarks : You need to improve");
// }
// else if(percent_marks < 60){
//     document.write("Grade : Fail <br>");
//     document.write("Remarks : Sorry!")
// }



// TASK # 7

// var secret_num  = 5;
// var user_guess_close = secret_num - 1;
// var user_guess = prompt("Guess the number from 1-10");
// if (user_guess == secret_num){
//     document.write("Bingo! Correct answer");
// }
// else if(user_guess == user_guess_close){
//     document.write("Close Enough to the answer.")

// }



// TASK # 8


// var user_num = prompt("Enter a number to check");
// if(user_num % 3 == 0){
//     document.write("The given number is divisible by zero");
// }
// else{
//     document.write("The given number is not divisible by zero");
// }


// TASK # 9

// var user_num = prompt("Input a number");
// if(user_num % 2 == 0){
//     document.write("The number is an even number")
// }
// else{
//     document.write("The number is an odd number")
// }



// TASK # 10

// var temp = prompt("Enter Temperature in celsius");
// if(temp > 40){
//     document.write("It is too hot outside");
// }
// else if(temp > 30){
//     document.write("The weather today is Normal");
// }
// else if(temp > 20){
//     document.write("Today Weather is cool");
// }
// else if(temp > 10){
//     document.write("OMG! Today’s weather is so Cool.");
// }


// TASK # 11


// var first_num = prompt("Enter First Number");
// var sec_num = prompt("Enter Second Number");
// var operation = prompt("Enter Operation");
// var result;
// if(operation == "+"){
//     result = parseInt(first_num) + parseInt(sec_num);
//     document.write(first_num + " + " + sec_num + " = " +result);

// }
// else if(operation == "-"){
//     result = (first_num) - (sec_num);
//     document.write(first_num + " - " + sec_num + " = " +result);

// }
// else if(operation == "*"){
//     result = (first_num) + (sec_num);
//     document.write(first_num + " x " + sec_num + " = " +result);

// }
// else if(operation == "/"){
//     result = (first_num) / (sec_num);
//     document.write(first_num + " / " + sec_num + " = " +result);

// }
// else if(operation == "%"){
//     result = (first_num) % (sec_num);
//     document.write(first_num + " % " + sec_num + " = " +result);

// }


                                                // CHAPTER # 12-13


// TASK # 1

// var input_type = prompt("Enter any character or number");
// if (input_type >= '0' && input_type <= '9'){
//     document.write("The input type is a number");
// }
// else if (input_type >= 'a' && input_type <= 'z'){
//     document.write("Input type is a lowercase character");
// }
// else if (input_type >= 'A' && input_type <= 'Z'){
//     document.write("Input type is an uppercase character");
// }


// TASK # 2

// var int_1 = prompt("Enter first integer");
// var int_2 = prompt("Enter second integer");
// if (int_1 > int_2){
//     document.write(int_1 + " is greater than " + int_2 );
// }
// else if (int_1 < int_2){
//     document.write(int_2 + " is greater than " + int_1 );
// }
// else if(int_1 == int_2){
//     document.write("Both the integers are equal");
// }


// TASK # 3

// var user_num = prompt("Enter a number");
// if (user_num > 0){
//     document.write("Entered Number is a positive number");
// }
// else if (user_num < 0){
//     document.write("Entered Number is a negative number");
// }
// else if (user_num == 0){
//     document.write("Entered Number is a zero");
// }


// TASK # 4

// var user_inp = prompt("Enter a string");
// if(user_inp == 'a' || user_inp == 'e' || user_inp == 'i' || user_inp == 'o' || user_inp == 'u'){
//     document.write("The string is a vowel");
// }
// else{
//     document.write("The String is not a vowel");
// }


// TASK # 5

// var password = 'faizan';
// var user_input = prompt("Enter Password: ");
// if(user_input.length == 0){
//     alert("Please enter your password");
// }
// else if(user_input === password){
//     alert("Correct! The password you entered matches the original password");
// }
// else{
//     alert("The password: " + user_input + " is incorrect");
// }



// TASK # 6

// var greeting;
// var hour = 13;
// if (hour < 18) {
// greeting = "Good day";
// document.write(greeting);
// }
// else{
// greeting = "Good evening";
// document.write(greeting);
// }


// TASK # 7



// var user_time = prompt("Enter time in 24 hour format");
// if(user_time >= 0000 && user_time < 1200){
//   alert("Good Morning");
// }
// else if(user_time >= 1200 && user_time < 1700){
//     alert("Good AfterNoon");
// }
// else if(user_time >= 1700 && user_time < 2100){
//     alert("Good Evening");
// }
// else if(user_time >= 2100 && user_time <= 2359){
//     alert("Good Night");
// }



                                                // CHAPTER # 14 - 16


// TASK # 1


// var arrayName = [];


// TASK # 3 


// var strings_arr = ['faizan' , 'shayan' , 'aaliyan'];



// TASK # 4

// var num_arr = [40 , 90 , 60 , 64];


// TASK # 5

// var bool_arr = [true , false];


// TASK # 4

// var mixed_arr = ['faizan' , 50 , 'shafay' , 60];



// TASK # 5

// var qualification_lvl = ['SSC', 'HSC', 'BCS', 'BS', 'BCOM', 'MS', 'M. Phil.', 'PhD'];
// document.write("<h2>Qualifications</h2>");
// var arr_val = qualification_lvl.length;
// for(let i=0 ; i < arr_val ; i++){
//     let val = qualification_lvl[i];
//     document.write(val + "<br>");
// }


// TASK # 6


// var student_names = ['faizan' , 'shayan' , 'aaliyan'];
// var score = ['320' , '230' , '480'];
// var total_marks = 500;
// var percentage_1 = (score[0] * 100)/total_marks;
// var percentage_2 = (score[1] * 100)/total_marks;
// var percentage_3 = (score[2] * 100)/total_marks;  
// document.write("Score of " + student_names[0] + " is " + score[0] + ". Percentage: " + percentage_1 + "%<br>");
// document.write("Score of " + student_names[1] + " is " + score[1] + ". Percentage: " + percentage_2 + "%<br>");
// document.write("Score of " + student_names[2] + " is " + score[2] + ". Percentage: " + percentage_3 + "%<br>");



// TASK # 7


// var colors = ['red' , 'yellow' , 'orange' , 'green' , 'purple'];
// document.write(colors + "<br>");
// var user_add_1 = prompt("What color do you want to add in the beginning?");
// colors.unshift(user_add_1);
// document.write(colors + "<br>");
// var users_add_2 = prompt("What color do you want to add in the end?");
// colors.push(users_add_2);
// document.write(colors + "<br>");
// colors.unshift('grey');
// colors.unshift('black');    
// document.write(colors + "<br>");
// colors.shift();
// document.write(colors + "<br>");
// colors.pop();
// document.write(colors + "<br>");
// var user_addcolor_index = prompt("Enter the index at which you want to add a color:");
// var color_def_index = prompt("Enter the color:");
// colors.splice(user_addcolor_index, 0 , color_def_index);
// document.write(colors + "<br>");
// var user_removecolors_index = prompt("Enter the index from which you want to remove a color: ");
// var quantity_of_colors = prompt("How many colors you want to remove starting from the index.no: ");
// colors.splice(user_removecolors_index , quantity_of_colors);
// document.write(colors);



// TASK # 10


// var scores_of_students = [320 , 230 , 480 , 120];
// document.write("<h3>Scores of Students: " + scores_of_students + "<br>");
// scores_of_students.sort();
// document.write("<h3>Ordered Scores of Students: " + scores_of_students);


// TASK # 11


// var city_names = ['karachi' , 'multan' , 'faisalabad' , 'rawalpindi' , 'islamabad' , 'hyderabad'];
// document.write("<h3>Cities List: <br>" + city_names);
// var copied_cities = city_names.slice(2 , 5);
// document.write("<h3>Selected Cities List: <br>" + copied_cities);



// TASK # 12


// var arr = ['This', 'is' , 'my' , 'cat'];
// document.write("Array: <br>" + arr + "<br>");
// document.write("String: <br>" + arr.join(" "));



// TASK # 13


// var arr_1 = [];
// arr_1.push('Keyboard' , 'Mouse' , 'Printer' , 'Monitor');
// document.write("<h3>Devices: <br>" + arr_1);
// for(i = 0 ; i < 4 ; i++){
// var array_val_out = arr_1.shift();
// document.write("<h3>Out: <br>" + array_val_out);
// }



// TASK # 14


// var arr_1 = [];
// arr_1.push('Keyboard' , 'Mouse' , 'Printer' , 'Monitor');
// document.write("<h3>Devices: <br>" + arr_1);
// for(i = 0 ; i < 4 ; i++){
// var array_val_out = arr_1.pop();
// document.write("<h3>Out: <br>" + array_val_out);
// }




                                                  // CHAPTER # 17-20


// TASK # 1

// var two_Dimensional_arr = [];
// two_Dimensional_arr.push(['faizan' , 5] , ['shayan' , 5]);




// TASK # 2

// var matrix_arr = [[0 , 1 , 2 , 3] , [1 , 0 , 1 , 2] , [2 , 1 , 0 ,1]];
// for(let i=0 ; i<3 ; i++){
// document.write(matrix_arr[i].join(" ") + "<br>");
// }



// TASK # 3


// for(let i = 1 ; i<=10 ; i++){
//     document.write(i + "<br>");
// }


// TASK # 4

// var table_num = prompt("Enter a number to show its multiplication table: ");
// var table_length = prompt("Enter table length: ");
// document.write("<h2>Multiplication Table of " + table_num + "<br>Length " + table_length + "<br>" + "<br>");
// for (let i = 1; i <= table_length; i++) {
//     var ans = table_num * i;
//     document.write(table_num + " x " + i + " = " + ans + "<br>");
// }


// TASK # 5


// var fruits = ['apple', 'banana', 'mango', 'orange' , 'strawberry'];
// for(i=0 ; i< fruits.length ; i++){ 
//     document.write("<h3>Element at index " + i + " is " + fruits[i] + "<br>");
// }



// TASK # 6


// document.write("<h2>Counting:<br>");
// for(let i = 1 ; i <= 15 ; i++){
//     document.write(i + ",");
// }
// document.write("<br><br>");
// document.write("Reverse Counting:<br>");
// for(let z=10 ; z>=1 ; z--){
//     document.write(z + ",");
// }
// document.write("<br><br>");
// document.write("<h2>Even:<br>");
// for(let i = 0 ; i <= 20 ; i=i+2){
//     document.write(i + ",");
// }
// document.write("<br><br>");
// document.write("<h2>Odd:<br>");
// for(let i = 1 ; i <= 19 ; i=i+2){
//     document.write(i + ",");
// }
// document.write("<br><br>");
// document.write("<h2>Series:<br>");
// for(let i = 2 ; i <= 20 ; i=i+2){
//     document.write(i + "k,");
// }


// TASK # 7

// var A = ['cake', 'apple pie', 'cookie', 'chips', 'patties'];
// var user_inp = prompt("Welcome to ABC Bakery.What do you want to Order Sir/Ma'am");
// for (var i = 0; i < 5; i++) {
//     if (user_inp == A[i] ) {
//         document.write(user_inp + " is available at index " + A.indexOf(user_inp) + " in our bakery");
        
//     }
//     else{
//         if(i > 5){
//             continue;
        
//         document.write("We are Sorry." + user_inp + " is not available in our bakery.");
//     }
       
//     }


// }



// TASK # 8

// var A = [24 , 53 , 78 , 91 , 12];
// var max_num = Math.max.apply(null , A);
// document.write("<h2>Array Items: " + A + "<br>");
// document.write("<h2>The Largest Number is: " + max_num);


// TASK # 9

// var A = [24 , 53 , 78 , 91 , 12];
// var min_num = Math.min.apply(null , A);
// document.write("<h2>Array Items: " + A + "<br>");
// document.write("<h2>The Smallest Number is: " + min_num);


// TASK # 10

// for(let i = 5 ; i<=100 ; i=i+5){
//     document.write(i + " ");
// }