Решение на упр.03 задача 2 от Станислав Стаматов

Обратно към всички решения

Към профила на Станислав Стаматов

Код

enum DriveError {

NotEnoughFuel { needed: f64, have: f64 },

}

enum VehicleKind {

Car,

Truck,

Motorcycle,

Bicycle,

}

///////////////////////////

struct Vehicle {

kind: VehicleKind,

fuel: f64,

distance: f64,

}

impl Vehicle {

pub fn new(kind: VehicleKind, fuel: f64) -> Self {

Не ли по-добре да се връща Result<Self, някаква грешка> например за невалидни данни като fuel <0

Станислав Стаматов коментира преди 1 ден

Self {

kind: kind,

fuel: fuel,

distance: 0.0,

}

}

pub fn drive(&mut self, km: f64) -> Result<(), DriveError> {

let fuel_consuming = match self.kind {

VehicleKind::Car => 0.07,

VehicleKind::Truck => 0.15,

VehicleKind::Motorcycle => 0.05,

VehicleKind::Bicycle => 0.0,

};

let needed_fuel = fuel_consuming * km;

if needed_fuel > self.fuel {

return Err(DriveError::NotEnoughFuel {

needed: needed_fuel,

have: self.fuel,

});

}

self.fuel -= needed_fuel;

Ok(())

}

}

Лог от изпълнението

Updating crates.io index
     Locking 17 packages to latest compatible versions
   Compiling proc-macro2 v1.0.103
   Compiling unicode-ident v1.0.22
   Compiling quote v1.0.41
   Compiling futures-core v0.3.31
   Compiling futures-sink v0.3.31
   Compiling futures-channel v0.3.31
   Compiling pin-project-lite v0.2.16
   Compiling memchr v2.7.6
   Compiling syn v2.0.108
   Compiling pin-utils v0.1.0
   Compiling futures-task v0.3.31
   Compiling futures-io v0.3.31
   Compiling slab v0.4.11
   Compiling solution v0.1.0 (/tmp/d20251030-1757769-1o0x5lv/solution)
warning: enum `DriveError` is never used
 --> src/lib.rs:1:6
  |
1 | enum DriveError {
  |      ^^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

warning: enum `VehicleKind` is never used
 --> src/lib.rs:4:6
  |
4 | enum VehicleKind {
  |      ^^^^^^^^^^^

warning: struct `Vehicle` is never constructed
  --> src/lib.rs:11:8
   |
11 | struct Vehicle {
   |        ^^^^^^^

warning: associated items `new` and `drive` are never used
  --> src/lib.rs:18:12
   |
17 | impl Vehicle {
   | ------------ associated items in this implementation
18 |     pub fn new(kind: VehicleKind, fuel: f64) -> Self {
   |            ^^^
...
25 |     pub fn drive(&mut self, km: f64) -> Result<(), DriveError> {
   |            ^^^^^

warning: `solution` (lib) generated 4 warnings
   Compiling futures-macro v0.3.31
   Compiling futures-util v0.3.31
   Compiling futures-executor v0.3.31
   Compiling futures v0.3.31
warning: fields `needed` and `have` are never read
 --> tests/../src/lib.rs:2:21
  |
2 |     NotEnoughFuel { needed: f64, have: f64 },
  |     -------------   ^^^^^^       ^^^^
  |     |
  |     fields in this variant
  |
  = note: `#[warn(dead_code)]` on by default

warning: variants `Truck`, `Motorcycle`, and `Bicycle` are never constructed
 --> tests/../src/lib.rs:6:5
  |
4 | enum VehicleKind {
  |      ----------- variants in this enum
5 |     Car,
6 |     Truck,
  |     ^^^^^
7 |     Motorcycle,
  |     ^^^^^^^^^^
8 |     Bicycle,
  |     ^^^^^^^

warning: field `distance` is never read
  --> tests/../src/lib.rs:14:5
   |
11 | struct Vehicle {
   |        ------- field in this struct
...
14 |     distance: f64,
   |     ^^^^^^^^

warning: `solution` (test "solution_test") generated 3 warnings
    Finished `test` profile [unoptimized + debuginfo] target(s) in 8.38s
     Running tests/solution_test.rs (target/debug/deps/solution_test-bfd50394249726db)

running 1 test
test solution_test::test_basic ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

История (1 версия и 1 коментар)