chapter 1-3 assignment

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "course-rust"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+rand = "0.8"
+

src/crypto_mining.rs

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+use rand::Rng;
+use std::io;
+
+pub fn main() {
+
+    println!("Enter a number N between 1 and 100 ");
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .expect("Failed to read input");
+    let n: usize = input.trim().parse().expect("Please enter a valid number");
+
+
+    if n < 1 || n > 100 {
+        println!("N must be between 1 and 100");
+        return;
+    }
+
+
+    let mut results = Vec::new();
+    for _ in 0..100 {
+        let count = repeat_experiment(n);
+        results.push(count);
+    }
+
+
+    let min = results.iter().min().unwrap();
+    let max = results.iter().max().unwrap();
+    let avg = results.iter().sum::<u32>() as f32 / results.len() as f32;
+
+    println!("\nResults for N = {}:", n);
+    println!("Min attempts: {}", min);
+    println!("Average attempts: {:.2}", avg);
+    println!("Max attempts: {}", max);
+}
+
+
+fn repeat_experiment(n: usize) -> u32 {
+    let mut rng = rand::thread_rng();
+
+    let mut targets: Vec<f32> = (0..n).map(|_| rng.gen_range(0.0..1.0)).collect();
+    let mut count = 0;
+
+
+    while !targets.is_empty() {
+        let random_num = rng.gen_range(0.0..1.0);
+
+        if let Some(pos) = targets.iter().position(|&x| (x - random_num).abs() < 0.01) {
+            targets.remove(pos);
+        }
+        count += 1;
+    }
+    count
+}

src/main.rs

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+
+mod crypto_mining;  
+
+fn main() {
+    crypto_mining::main(); 
+}