Loop construct in Rust - Mini Project: Build & Apply

Loop construct in Rust

📖 Scenario: You are helping a small shop owner count the total number of items sold in a day. The shop owner has a list of daily sales numbers for each hour.

🎯 Goal: Build a Rust program that uses a loop construct to sum all the sales numbers and print the total.

📋 What You'll Learn

Create a vector called sales with the exact values: 5, 8, 12, 3, 7

Create a variable called total and set it to 0

Use a loop construct with an index variable i to iterate over sales

Add each sale to total inside the loop

Break the loop when all sales are added

Print the final total value

💡 Why This Matters

🌍 Real World

Counting totals from lists of numbers is common in sales, inventory, and data analysis.

💼 Career

Understanding loops and data structures like vectors is essential for software development and data processing jobs.

1

Create the sales data

Create a vector called sales with the exact values 5, 8, 12, 3, 7.

Rust

# Create a vector called sales with values 5, 8, 12, 3, 7
// Your code here

Need a hint?

Use let sales = vec![5, 8, 12, 3, 7]; to create the vector.

2

Initialize the total counter

Create a variable called total and set it to 0 inside the main function, below the sales vector.

Rust

fn main() {
    let sales = vec![5, 8, 12, 3, 7];
    // Create a variable called total and set it to 0
    // Your code here
}

Need a hint?

Use let mut total = 0; to create a variable that can change.

3

Use a loop to sum sales

Use a loop construct with an index variable i starting at 0 to iterate over the sales vector. Inside the loop, add sales[i] to total. Break the loop when i reaches the length of sales.

Rust

fn main() {
    let sales = vec![5, 8, 12, 3, 7];
    let mut total = 0;
    // Use a loop with index i to sum sales
    // Your code here
}

Need a hint?

Start with let mut i = 0;. Use loop { ... }. Inside, check if i == sales.len() to break. Add sales[i] to total and increase i by 1.

4

Print the total sales

Add a println! statement to print the total variable after the loop ends.

Rust

fn main() {
    let sales = vec![5, 8, 12, 3, 7];
    let mut total = 0;
    let mut i = 0;
    loop {
        if i == sales.len() {
            break;
        }
        total += sales[i];
        i += 1;
    }
    // Print the total sales
    // Your code here
}

Need a hint?

Use println!("Total sales: {}", total); to show the result.