| 1 |
// Unlike C/C++, there's no restriction on the order of function definitions |
| 2 |
fn main() { |
| 3 |
// We can use this function here, and define it somewhere later |
| 4 |
fizzbuzz_to(100); |
| 5 |
} |
| 6 |
|
| 7 |
// Function that returns a boolean value |
| 8 |
fn is_divisible_by(lhs: u32, rhs: u32) -> bool { |
| 9 |
// Corner case, early return |
| 10 |
if rhs == 0 { |
| 11 |
return false; |
| 12 |
} |
| 13 |
|
| 14 |
// This is an expression, the `return` keyword is not necessary here |
| 15 |
lhs % rhs == 0 |
| 16 |
} |
| 17 |
|
| 18 |
// Functions that "don't" return a value, actually return the unit type `()` |
| 19 |
fn fizzbuzz(n: u32) -> () { |
| 20 |
if is_divisible_by(n, 15) { |
| 21 |
println!("fizzbuzz"); |
| 22 |
} else if is_divisible_by(n, 3) { |
| 23 |
println!("fizz"); |
| 24 |
} else if is_divisible_by(n, 5) { |
| 25 |
println!("buzz"); |
| 26 |
} else { |
| 27 |
println!("{}", n); |
| 28 |
} |
| 29 |
} |
| 30 |
|
| 31 |
// When a function returns `()`, the return type can be omitted from the |
| 32 |
// signature |
| 33 |
fn fizzbuzz_to(n: u32) { |
| 34 |
for n in 1..=n { |
| 35 |
fizzbuzz(n); |
| 36 |
} |
| 37 |
} |
| 38 |
|
| 39 |
// From https://doc.rust-lang.org/rust-by-example/fn.html |
| 40 |
|
