Functions Basic

Define and call functions with parameters and return values.

Difficulty

Beginner

Code

fn add(a: i32, b: i32) -> i32 {
    a + b
}

fn greet(name: &str) {
    println!("Hello, {}!", name);
}

fn main() {
    let result = add(3, 5);
    println!("3 + 5 = {}", result);
    greet("Rust");
}

Explanation

Functions defined with fn. Last expression without ; is the return value.

Key Concepts

• Read the code carefully and understand the data flow
• Try modifying the example to see how it changes behavior
• Run this code in the Rust Playground

Related Topics

Browse more examples in the functions category to build a complete understanding of this topic.