Untitled

1a. Source Code:
<!DOCTYPE html>
<html>
<head>
<title>Dynamic Input Experiment</title>
<script>
// Log "Hello, World!" to the console
console.log("Hello, World!"); 
// Display "Hello, World!" on the webpage
document.addEventListener("DOMContentLoaded", function() {
document.body.innerHTML += "<h1>Hello, World!</h1>";
});
// Read numbers from user input
let num1 = parseFloat(prompt("Enter the first number:")); 
let num2 = parseFloat(prompt("Enter the second number:")); 
// Validate input and calculate sum
if (!isNaN(num1) && !isNaN(num2)) {
let sum = num1 + num2;
alert("The sum is: " + sum); 
} else {
alert("Invalid input! Please enter numbers.");
}
</script>
</head>
<body>
</body>
</html>


1b. Source Code: 
const prompt = require('prompt-sync')(); 
// Prompt the user to enter 5 city names, separated by commas 
let input = prompt("Enter 5 cities separated by commas: "); 
let cities = input.split(',').map(city => city.trim()); 
console.log("Initial cities:", cities); 
// Log the total number of cities 
console.log("Total number of cities:", cities.length); 
// Add a new city at the end 
let newCity = prompt("Enter a city to add to the end: "); 
cities.push(newCity); 
console.log("Cities after adding a new one:", cities); 
// Remove the first city 
//console.log("Removing the first city:", cities[0]); // Log the first city 
before removal 
cities.shift(); 
console.log("Cities after removing the first one:", cities); 
// Find and log the index of a specific city
let searchCity = prompt("Enter a city to find its index: "); 
let cityIndex = cities.indexOf(searchCity); 
console.log("Index of", searchCity + ":", cityIndex !== -1 ? cityIndex :
"City notfound");
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