Exercises – Complete Javascript Course

Exercises:

Variable Declaration:
- Declare a variable named favoriteNumber and assign your favorite number to it. Then, log the value to the console.
```
let favoriteNumber = 7;
console.log("My favorite number is: " + favoriteNumber);
```
String Manipulation:
- Create two variables, firstName and lastName, with your first and last names. Combine them to form a full name and log it to the console.
```
let firstName = "John";
let lastName = "Doe";
let fullName = firstName + " " + lastName;
console.log("My full name is: " + fullName);
```
Arithmetic Operations:
- Calculate the area of a rectangle with a width of 8 units and a height of 5 units. Log the result to the console.
```
let width = 8;
let height = 5;
let area = width * height;
console.log("The area of the rectangle is: " + area);
```
Boolean Logic:
- Write a program that checks if a user is eligible to vote based on their age. If a user is 18 years or older, log "You can vote!" to the console; otherwise, log "You cannot vote."
```
let userAge = 20;
if (userAge >= 18) {
  console.log("You can vote!");
} else {
  console.log("You cannot vote.");
}
```

Homework:

Variable Declarations:
- Create three variables: carBrand, carModel, and carYear. Assign values to them that represent a car's brand, model, and manufacturing year. Log all three values to the console.
```
let carBrand = "Toyota";
let carModel = "Camry";
let carYear = 2022;
console.log("Car: " + carYear + " " + carBrand + " " + carModel);
```

String Operations:

Declare a variable sentence and assign it a sentence of your choice. Find the length of the sentence and log it to the console.

let sentence = "JavaScript is a powerful programming language.";
let sentenceLength = sentence.length;
console.log("The length of the sentence is: " + sentenceLength + " characters.");

Temperature Conversion:

Write a program to convert a temperature from Celsius to Fahrenheit. Prompt the user for the temperature in Celsius and then display the equivalent temperature in Fahrenheit.

let celsiusTemperature = prompt("Enter temperature in Celsius:");
let fahrenheitTemperature = (celsiusTemperature * 9/5) + 32;
console.log("The temperature in Fahrenheit is: " + fahrenheitTemperature);

Boolean Logic and Conditions:

Create a program that checks if a user's username and password match a predefined set of credentials. Provide appropriate messages for both correct and incorrect login attempts.

let storedUsername = "user123";
let storedPassword = "password123";

let enteredUsername = prompt("Enter your username:");
let enteredPassword = prompt("Enter your password:");

if (enteredUsername === storedUsername && enteredPassword === storedPassword) {
  console.log("Login successful!");
} else {
  console.log("Login failed. Please check your credentials.");
}

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