mirror of
https://github.com/rust-lang/rustlings.git
synced 2024-12-14 11:22:55 +02:00
88 lines
2.2 KiB
Rust
88 lines
2.2 KiB
Rust
// This is a bigger exercise than most of the others! You can do it! Here is
|
|
// your mission, should you choose to accept it:
|
|
// 1. Complete the divide function to get the first four tests to pass.
|
|
// 2. Get the remaining tests to pass by completing the result_with_list and
|
|
// list_of_results functions.
|
|
|
|
#[derive(Debug, PartialEq, Eq)]
|
|
enum DivisionError {
|
|
NotDivisible(NotDivisibleError),
|
|
DivideByZero,
|
|
}
|
|
|
|
#[derive(Debug, PartialEq, Eq)]
|
|
struct NotDivisibleError {
|
|
dividend: i32,
|
|
divisor: i32,
|
|
}
|
|
|
|
// Calculate `a` divided by `b` if `a` is evenly divisible by `b`.
|
|
// Otherwise, return a suitable error.
|
|
fn divide(a: i32, b: i32) -> Result<i32, DivisionError> {
|
|
todo!();
|
|
}
|
|
|
|
// Complete the function and return a value of the correct type so the test
|
|
// passes.
|
|
// Desired output: Ok([1, 11, 1426, 3])
|
|
fn result_with_list() -> () {
|
|
let numbers = vec![27, 297, 38502, 81];
|
|
let division_results = numbers.into_iter().map(|n| divide(n, 27));
|
|
}
|
|
|
|
// Complete the function and return a value of the correct type so the test
|
|
// passes.
|
|
// Desired output: [Ok(1), Ok(11), Ok(1426), Ok(3)]
|
|
fn list_of_results() -> () {
|
|
let numbers = vec![27, 297, 38502, 81];
|
|
let division_results = numbers.into_iter().map(|n| divide(n, 27));
|
|
}
|
|
|
|
fn main() {
|
|
// You can optionally experiment here.
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn test_success() {
|
|
assert_eq!(divide(81, 9), Ok(9));
|
|
}
|
|
|
|
#[test]
|
|
fn test_not_divisible() {
|
|
assert_eq!(
|
|
divide(81, 6),
|
|
Err(DivisionError::NotDivisible(NotDivisibleError {
|
|
dividend: 81,
|
|
divisor: 6
|
|
}))
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn test_divide_by_0() {
|
|
assert_eq!(divide(81, 0), Err(DivisionError::DivideByZero));
|
|
}
|
|
|
|
#[test]
|
|
fn test_divide_0_by_something() {
|
|
assert_eq!(divide(0, 81), Ok(0));
|
|
}
|
|
|
|
#[test]
|
|
fn test_result_with_list() {
|
|
assert_eq!(format!("{:?}", result_with_list()), "Ok([1, 11, 1426, 3])");
|
|
}
|
|
|
|
#[test]
|
|
fn test_list_of_results() {
|
|
assert_eq!(
|
|
format!("{:?}", list_of_results()),
|
|
"[Ok(1), Ok(11), Ok(1426), Ok(3)]"
|
|
);
|
|
}
|
|
}
|