🚀 41_guess add rust

41_Guess/rust/Cargo.toml

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+[package]
+name = "guess"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.8.4"

41_Guess/rust/README.md

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+Original source downloaded [from Vintage Basic](http://www.vintage-basic.net/games.html)
+
+Conversion to [Python](https://www.rust-lang.org/)

41_Guess/rust/src/main.rs

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+use rand::Rng;
+use std::io;
+use std::cmp::Ordering;
+// Rust haven't log2 in the standard library so I added fn log_2 
+const fn num_bits<T>() -> usize { std::mem::size_of::<T>() * 8 }
+
+fn main() {
+
+    let mut rng = rand::thread_rng();
+    let mut still_guessing = true;
+    let limit = set_limit();
+    let limit_goal = 1+(log_2(limit.try_into().unwrap())/log_2(2)) ;
+    loop{
+
+        let mut won = false;
+        let mut guess_count = 1;
+        let my_guess = rng.gen_range(1..limit);
+
+        println!("I'm thinking of a number between 1 and {}",limit);
+        println!("Now you try to guess what it is.");
+
+        while still_guessing {
+            let inp = get_input()
+                .trim()
+                .parse::<i64>().unwrap();
+            println!("\n\n\n");
+            if inp < my_guess {
+                println!("Too low. Try a bigger answer");
+                guess_count+=1;
+            }
+            else if inp > my_guess {
+                println!("Too high. Try a smaller answer");
+                guess_count+=1;
+            }
+            else {
+                println!("That's it! You got it in {} tries", guess_count);
+                won = true;
+                still_guessing = false;
+            }
+        }
+        if won {
+            match guess_count.cmp(&limit_goal) {
+                Ordering::Less => println!("Very good."),
+                Ordering::Equal => println!("Good."),
+                Ordering::Greater => println!("You should have been able to get it in only {}", limit_goal),
+            }
+
+            println!("\n\n\n");
+            still_guessing = true;
+        } else {
+            println!("\n\n\n");
+        }
+    }
+}
+
+fn log_2(x:i32) -> u32 {
+    assert!(x > 0);
+    num_bits::<i32>() as u32 - x.leading_zeros() - 1
+}
+
+fn set_limit() -> i64 {
+
+    println!("                   Guess");
+    println!("\n\n\n");
+    println!("This is a number guessing game. I'll think");
+    println!("of a number between 1 and any limit you want.\n");
+    println!("Then you have to guess what it is\n");
+    println!("What limit do you want?");
+
+    let inp = get_input().trim().parse::<i64>().unwrap();
+
+    if inp >= 2 {
+        inp
+    } 
+    else {
+        set_limit()
+    }
+}
+
+fn get_input() -> String {
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .expect("Your input is not correct");
+    input
+}