Functions and Errors

Functions

Inputs and Return

A function names a calculation. The final expression with no semicolon is the return value.

Program

Play the program to send a subtotal through a function and back.

functions.rs 
fn main() {
    let subtotal = 25;
    let total = add_tax(subtotal);
    println!("{total}");
}

fn add_tax(price: i32) -> i32 {
    price + price / 10
}
fn `fn add_tax(price: i32) -> i32` declares inputs and output.
argument `add_tax(subtotal)` passes the current subtotal.
implicit return The last expression (no `;`) is returned.