Arithmetic operators in Rust - Mini Project: Build & Apply

Arithmetic Operators in Rust

📖 Scenario: You are helping a small shop calculate prices for items bought by customers. You will use arithmetic operators to add, subtract, multiply, and divide numbers.

🎯 Goal: Build a Rust program that uses arithmetic operators to calculate the total price, discount, and final price for a product.

📋 What You'll Learn

Create variables with exact values for price and quantity

Create a variable for discount rate

Calculate total price and discount amount using arithmetic operators

Print the final price after discount

💡 Why This Matters

🌍 Real World

Calculating prices, discounts, and totals is common in shopping apps and billing systems.

💼 Career

Understanding arithmetic operations and data types is essential for software development, especially in finance and retail applications.

1

Create initial variables for price and quantity

Create a variable called price with the value 50.0 and a variable called quantity with the value 3.

Rust

# Create variables price and quantity with given values
// Your code here

Need a hint?

Use let to create variables. Price is a floating-point number, quantity is an integer.

2

Add a discount rate variable

Add a variable called discount_rate with the value 0.1 to represent a 10% discount.

Rust

fn main() {
    let price = 50.0;
    let quantity = 3;
    // Add discount_rate variable here
    // Your code here
}

Need a hint?

Discount rate is a floating-point number between 0 and 1.

3

Calculate total price and discount amount

Create a variable called total_price that multiplies price and quantity. Then create a variable called discount_amount that multiplies total_price and discount_rate.

Rust

fn main() {
    let price = 50.0;
    let quantity = 3;
    let discount_rate = 0.1;
    // Calculate total_price and discount_amount
    // Your code here
}

Need a hint?

Multiply price and quantity. Convert quantity to f64 to match price type.

4

Print the final price after discount

Calculate the final price by subtracting discount_amount from total_price and print it using println! with the message: "Final price: {final_price}".

Rust

fn main() {
    let price = 50.0;
    let quantity = 3;
    let discount_rate = 0.1;
    let total_price = price * quantity as f64;
    let discount_amount = total_price * discount_rate;
    // Calculate final_price and print it
    // Your code here
}

Need a hint?

Subtract discount_amount from total_price. Use println!("Final price: {}", final_price); to show the result.