//if, else if, else, switch

//Runs a block of code if a condition is true.

//Used for multiple conditions.

//Runs one block if true, another if false.

//Used when there are many conditions on a single variable.

//Used for decision making

let age = 18;

if(age>=18){

console.log("You can Vote");

}

let age1 = 14;

if(age1>=18){

console.log("You Can Vote");

}else{

console.log("You can not Vote");

}

//let marks = 85;

//if(marks>=85){

//console.log("Grade: "+A)

//}else if (marks>=75){

//console.log("Grade: "+B)

//}else(marks>=65){ not add any value in else statement

//console.log("Grade: "+C)

//}

let marks = 85;

if (marks >= 85) {

console.log("Grade: " + "A");

} else if (marks >= 75) {

console.log("Grade: " + "B");

} else if (marks >= 65) {

console.log("Grade: " + "C");

} else {

console.log("Grade: " + "D");

}

let day = 3;

switch (day) {

case 1:

console.log("Monday");

break;

case 2:

console.log("Tuesday");

break;

case 3:

console.log("Wednesday");

break;

default:

console.log("Invalid day");

}

let subject = "english";

switch(day){

case 1 :

console.log("Math");

break;

case 2 :

console.log("Physics");

break;

case 3 :

console.log("English");

break;

default:

console.log("Invalid Subject");

}

//Check if a Number is Positive, Negative, or Zero

let num = -5;

if (num > 0) {

console.log("Positive number");

} else if (num < 0) {

console.log("Negative number");

} else {

console.log("Zero");

}

let number = 6;

if(number>0){

console.log("Positive number");

}else if (number < 0) {

console.log("Negative number");

}else {

console.log("Zero");

}

//Check if a Number is Even or Odd

let num1 = 7;

if (num1 % 2 === 0) {

console.log("Even number");

} else {

console.log("Odd number");

}

//Find the Largest of Three Number

let a = 15, b = 25, c = 20;

if (a > b && a > c) {

console.log("A is the largest");

} else if (b > a && b > c) {

console.log("B is the largest");

} else {

console.log("C is the largest");

}

//Leap Year Checker

let year = 2025;

if ((year % 4 === 0 && year % 100 !== 0) || year % 400 === 0) {

console.log(year + " is a Leap Year");

} else {

console.log(year + " is not a Leap Year");

}

//Check if a Character is a Vowel or Consonant

let ch = 'e';

if (ch == 'a' || ch == 'e' || ch == 'i' || ch == 'o' || ch == 'u' ||

ch == 'A' || ch == 'E' || ch == 'I' || ch == 'O' || ch == 'U') {

console.log("Vowel");

} else {

console.log("Consonant");

}

//Electricity Bill Calculator

let units = 180;

let bill = 0;

if (units <= 100) {

bill = units * 5;

} else if (units <= 200) {

bill = (100 * 5) + ((units - 100) * 7);

} else {

bill = (100 * 5) + (100 * 7) + ((units - 200) * 10);

}

console.log("Total Bill: ₹" + bill);

//Traffic Light Simulator

let signal = "yellow";

if (signal === "red") {

console.log("Stop");

} else if (signal === "yellow") {

console.log("Get Ready");

} else if (signal === "green") {

console.log("Go");

} else {

console.log("Invalid signal color");

}

//Simple Calculator

let number1 = 20;

let number2 = 5;

let operator = "*";

if (operator === "+") {

console.log(number1 + number2);

} else if (operator === "-") {

console.log(number1 - number2);

} else if (operator === "*") {

console.log(number1 * number2);

} else if (operator === "/") {

console.log(number1 / number2);

} else {

console.log("Invalid operator");

}

let marks1 = 75;

if(marks>90){

console.log("Grade: A");

}else if(marks>=75){

console.log("Grade: B");

}

else {

console.log("Grade: B");

}

let day1= 3;

switch(day){

case 1:

console.log("Monday");

break;

case 2:

console.log("Tuesday");

break;

case 3:

console.log("Wednesday");

break;

case 4:

console.log("Thursday");

break;

default:

console.log("Hii" + day1);

}

//Ternary Operator (?:)

let isLoggedIn = true;

let message = isLoggedIn ? "Welcome back!" : "Please log in.";

console.log(message);

let isLoggedOut = true;

let message1 = isLoggedOut ? "Meet You Again!" : "Office time is over";

console.log(message1);

//Looping Statement

let college = "RajaRajeswari College Of Engineering";

for (let i = 1; i <= 5; i++) {

console.log(college);

}

let college1 = 'Rv College Of Engineering';

for(let i =1; i<5;i++){

console.log(college1);

}

//let college2 = 'S N Sinha College'

//for(let i = 2; i<=6; i++){

//console.log(college2);

//}

let college3 = 'S N Sinha College1'

for(let i = 0; i<=5;i++){

console.log(college3);

}

//While Loop

//Used when you don't know how many times, but you loop until a condition becomes false.

let i = 1;

while (i <= 5) {

console.log("Hi");

i++;

}

let i2 = 1;

while(i2<=5) {

console.log('Hello');

i2++;

}

let i3= 1;

while(i3<=5){

console.log("Hello Kaise Hoo");

i3++;

}

let i4 = 1;

while(i4<=4){

console.log("Hi Mai Bhadhiya Huu Tum Kaise Hoo");

i4++;

}

let i5 = 2;

while(i5<-10){

console.log("Hey, How are You"); //while(i5 < -10) → this means the loop will run only if i5 is less than -10

i5++;

} //The loop never runs //No Output

//let name = 'Anup';

//while(name<=anup){

//console.log("Hey Anup Kaise Hoo");

//name++;

//}

let name = 'Anup';

let count = 1;

while (count <= 5) {

console.log("Hey " + name + " Kaise Hoo");

count++;

}

let name1 = 'Anup Kumar Singh';

let count1 = 1;

while(count1 <=5 ) {

console.log("Hey " + name1 + " How are You");

count1++;

}

let i1 = 1;

do {

console.log("Hello");

i1++;

} while (i1 <= 5);

let i6 = 1;

do{

console.log("Hello How are You");

i6++;

}while (i6 <=10);

let i8 = 1;

do {

console.log("Hello When will come")

i8++;

}while(i8<+5) //4 Output

let name3 = "Anup";

for (let char of name3) {

console.log(char);

}

let name4 = "Shubham";

for(let char of name4) {

console.log(char);

}

let person = {

name: "Anup",

age: 20

};

for (let key in person) {

console.log(key, person[key]);

}

let person1 = {

name4:"Shubham",

age3: 30

};

for(let key in person){

console.log(key, person[key]);

}

//JavaScript return Statement (With Examples)

function add(a, b) {

return a + b; // sends the result back

}

let result = add(5, 3);

console.log(result);

function add(b,c) {

return b+c;

}

let result_1 = add(10,19);

console.log(result_1);