Arithmetic operators in Java - Mini Project: Build & Apply

Arithmetic Operators in Java

📖 Scenario: You are helping a small shop owner calculate the total cost of items bought by customers. You will use arithmetic operators to add, subtract, multiply, and divide prices.

🎯 Goal: Build a simple Java program that uses arithmetic operators to calculate the total price, discount, and final amount to pay.

📋 What You'll Learn

Create variables for item prices

Create a variable for discount percentage

Calculate total price using addition

Calculate discount amount using multiplication

Calculate final price after discount using subtraction

Print the final price

💡 Why This Matters

🌍 Real World

Calculating prices and discounts is common in shopping and billing systems.

💼 Career

Understanding arithmetic operators is essential for any programming job involving calculations or data processing.

1

Create item price variables

Create three double variables called price1, price2, and price3 with values 10.5, 20.0, and 5.5 respectively.

Java

# Your code here

Need a hint?

Use double type for prices and assign the exact values.

2

Add discount percentage variable

Add a double variable called discountPercent and set it to 10.0 to represent a 10% discount.

Java

public class ArithmeticOperators {
    public static void main(String[] args) {
        double price1 = 10.5;
        double price2 = 20.0;
        double price3 = 5.5;
        // Your code here
    }
}

Need a hint?

Remember to use double for the discount percentage.

3

Calculate total, discount amount, and final price

Calculate the total price by adding price1, price2, and price3 into a double variable called totalPrice. Then calculate the discount amount by multiplying totalPrice with discountPercent divided by 100 into a double variable called discountAmount. Finally, calculate the final price after discount by subtracting discountAmount from totalPrice into a double variable called finalPrice.

Java

public class ArithmeticOperators {
    public static void main(String[] args) {
        double price1 = 10.5;
        double price2 = 20.0;
        double price3 = 5.5;
        double discountPercent = 10.0;
        // Calculate totalPrice, discountAmount, and finalPrice
        // Your code here
    }
}

Need a hint?

Use + for addition, * for multiplication, and - for subtraction.

4

Print the final price

Use System.out.println to print the text "Final price: " followed by the value of finalPrice.

Java

public class ArithmeticOperators {
    public static void main(String[] args) {
        double price1 = 10.5;
        double price2 = 20.0;
        double price3 = 5.5;
        double discountPercent = 10.0;
        double totalPrice = price1 + price2 + price3;
        double discountAmount = totalPrice * discountPercent / 100;
        double finalPrice = totalPrice - discountAmount;
        // Print the final price
        // Your code here
    }
}

Need a hint?

Use System.out.println("Final price: " + finalPrice); to print the result.