Functions

Exercises

Definition

// Something's missing from the function definition. Fix it so it compiles!

fn main() {
    call_me(9395550113);
}

fn call_me(num:) {
    println!("Ring! Call number {}", num);
}

fn main() {
  call_me(9395550113);
}

fn call_me(num: i64) {
  println!("Ring! Call number {}", num);
}

Return types

// This store is having a sale where if the price is an even number, you get
// 10 Rustbucks off, but if it's an odd number, it's 3 Rustbucks off.
// But it won't compile--fix it
// (Don't worry about the function bodies themselves, we're only interested
// in the signatures for now)

fn main() {
    let original_price = 51;
    println!("Your sale price is {}", sale_price(original_price));
}

fn sale_price(price: i32) -> {
    if is_even(price) {
        price - 10
    } else {
        price - 3
    }
}

fn is_even(num: i32) -> bool {
    num % 2 == 0
}

fn main() {
  let original_price = 51;
  println!("Your sale price is {}", sale_price(original_price));
}

fn sale_price(price: i32) -> i32 {
  if is_even(price) {
      price - 10
  } else {
      price - 3
  }
}

fn is_even(num: i32) -> bool {
  num % 2 == 0
}

Return keyword

// This function describes a morning in the life of a Rust programmer.
// She has a few morning rituals, but she skips all that if she wakes up late!
// Fix the morning_routine function to return early when the Rust programmer wakes up late.

fn main() {
    let i_woke_up_late = true;
    morning_routine(i_woke_up_late);
}

fn morning_routine(i_am_late: bool) {
    println!("This morning, I...");
    if i_am_late {
        go_to_work();
    }
    exercise();
    eat_breakfast();
    make_coffee();
    go_to_work();
}

fn exercise() {
    println!("I went to the gym.");
}

fn eat_breakfast() {
    println!("I had a healthy breakfast!");
}

fn make_coffee() {
    println!("I made myself coffee. Now that I'm ready..."); 
}

fn go_to_work() {
    println!("I went straight to work!");
}

fn main() {
  let i_woke_up_late = true;
  morning_routine(i_woke_up_late);
}

fn morning_routine(i_am_late: bool) {
  println!("This morning, I...");
  if i_am_late {
      go_to_work();
      return;
  }
  exercise();
  eat_breakfast();
  make_coffee();
  go_to_work();
}

fn exercise() {
  println!("I went to the gym.");
}

fn eat_breakfast() {
  println!("I had a healthy breakfast!");
}

fn make_coffee() {
  println!("I made myself coffee. Now that I'm ready..."); 
}

fn go_to_work() {
  println!("I went straight to work!");
}