mirror of
https://github.com/coding-horror/basic-computer-games.git
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Merge pull request #941 from UncleScientist/rust_42_gunner
Add Rust port of 42_Gunner
This commit is contained in:
Jeff Atwood
411
42_Gunner/rust/Cargo.lock
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411
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42_Gunner/rust/Cargo.toml
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|
||||
edition = "2024"
|
||||
|
||||
[dependencies]
|
||||
rand = "0.10.0"
|
||||
161
42_Gunner/rust/src/main.rs
Normal file
161
42_Gunner/rust/src/main.rs
Normal file
@@ -0,0 +1,161 @@
|
||||
use rand::{RngExt, rngs::ThreadRng};
|
||||
use std::{
|
||||
convert::Infallible,
|
||||
io::{self, BufRead, Write},
|
||||
str::FromStr,
|
||||
};
|
||||
|
||||
fn main() {
|
||||
println!("{:>30}GUNNER", "");
|
||||
println!("{:>15}CREATIVE COMPUTING MORRISTOWN, NEW JERSEY", "");
|
||||
println!("\n\n");
|
||||
|
||||
println!("You are the officer-in-charge, giving orders to a gun");
|
||||
println!("crew, telling them the degrees of elevation you estimate");
|
||||
println!("will place a projectile on target. A hit wihtin 100 yards");
|
||||
println!("of the target will destroy it.\n");
|
||||
|
||||
let mut game = GunnerGame::new();
|
||||
while game.run() == PlayAgain::Yes {
|
||||
// do nothing -- just loop around and call game.run() again
|
||||
}
|
||||
}
|
||||
|
||||
struct GunnerGame {
|
||||
gun_range: usize, // each game has different range for the gun. "R" in the basic code
|
||||
targets_destroyed: isize, // the "Z" counter in basic
|
||||
total_rounds: isize, // how many rounds were fired across all targets. "S1" in basic
|
||||
rng: ThreadRng, // our PRNG
|
||||
}
|
||||
|
||||
impl GunnerGame {
|
||||
fn new() -> Self {
|
||||
let mut rng = rand::rng();
|
||||
let gun_range = rng.random_range(20_000..=60_000);
|
||||
|
||||
Self {
|
||||
gun_range,
|
||||
rng,
|
||||
targets_destroyed: 0,
|
||||
total_rounds: 0,
|
||||
}
|
||||
}
|
||||
|
||||
fn run(&mut self) -> PlayAgain {
|
||||
println!("Maximum range of your gun is {} yards.\n", self.gun_range);
|
||||
|
||||
for targets in 0..4 {
|
||||
if targets > 0 {
|
||||
// After the first round, we want to let the user know that there's
|
||||
// another target in sight
|
||||
println!("\nThe forward observer has sighted more enemy activity...");
|
||||
}
|
||||
|
||||
// let the player try to destroy it
|
||||
let target_destroyed = self.handle_target();
|
||||
|
||||
if !target_destroyed {
|
||||
println!("\nBoom !!!! You have just been destroyed by the enemy.\n\n\n");
|
||||
println!("Better go back to Fort Sill for refresher training!");
|
||||
|
||||
println!();
|
||||
break;
|
||||
} else {
|
||||
self.targets_destroyed += 1;
|
||||
}
|
||||
}
|
||||
|
||||
// only display success message if all targets were destroyed
|
||||
if self.targets_destroyed == 4 {
|
||||
println!("\n\nTotal rounds expended were: {}", self.total_rounds);
|
||||
if self.total_rounds <= 18 {
|
||||
println!("Nice shooting !!");
|
||||
}
|
||||
}
|
||||
|
||||
println!("\n");
|
||||
get_input("Try again (Y or N)")
|
||||
}
|
||||
|
||||
fn handle_target(&mut self) -> bool {
|
||||
let target_distance =
|
||||
((self.gun_range as f32) * (0.1 + 0.8 * self.rng.random::<f32>())) as isize;
|
||||
|
||||
println!("Distance to the target is {target_distance} yards.\n\n");
|
||||
|
||||
// The player gets 5 shots. On the 6th shot we still ask for an elevation,
|
||||
// but then report that they've been destroyed.
|
||||
for shots_fired in 1..=6 {
|
||||
let elevation = loop {
|
||||
let elevation: f32 = get_input("Elevation");
|
||||
|
||||
// Let the player know how well they did.
|
||||
if elevation < 1.0 {
|
||||
println!("Miniumum elevation is one degree.");
|
||||
} else if elevation > 89.0 {
|
||||
println!("Maximum elevation is 89 degrees.");
|
||||
} else {
|
||||
break elevation;
|
||||
}
|
||||
};
|
||||
|
||||
// Only allow the player to destroy the target with the first 5 shots. The
|
||||
// sixth is ignored.
|
||||
if shots_fired < 6 {
|
||||
let angle = 2.0 * elevation / 57.3;
|
||||
let intersection = self.gun_range as f32 * angle.sin();
|
||||
let delta = target_distance - (intersection as isize);
|
||||
|
||||
if delta.abs() < 100 {
|
||||
println!(
|
||||
"*** Target Destroyed *** {shots_fired} rounds of ammunition expended."
|
||||
);
|
||||
self.total_rounds += shots_fired;
|
||||
return true;
|
||||
} else if delta > 100 {
|
||||
println!("Short of target by {delta} yards.");
|
||||
} else {
|
||||
println!("Over target by {} yards.", delta.abs());
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
false
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(PartialEq, Eq)]
|
||||
enum PlayAgain {
|
||||
Yes,
|
||||
No,
|
||||
}
|
||||
|
||||
impl FromStr for PlayAgain {
|
||||
type Err = Infallible;
|
||||
|
||||
fn from_str(line: &str) -> Result<Self, Self::Err> {
|
||||
if line.to_uppercase() == "Y" {
|
||||
Ok(Self::Yes)
|
||||
} else {
|
||||
Ok(Self::No)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
fn get_input<R: FromStr, S: AsRef<str>>(prompt: S) -> R {
|
||||
loop {
|
||||
print!("{}? ", prompt.as_ref());
|
||||
let mut stdout = io::stdout().lock();
|
||||
let _ = stdout.flush();
|
||||
|
||||
let mut buffer = String::new();
|
||||
let stdin = std::io::stdin();
|
||||
let mut handle = stdin.lock();
|
||||
let _ = handle.read_line(&mut buffer);
|
||||
|
||||
if let Ok(result) = buffer.trim().to_string().parse::<R>() {
|
||||
return result;
|
||||
}
|
||||
println!("?Re-enter");
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user