From 0c44dc91f8f034d733838af1d7e91f8e567edcbc Mon Sep 17 00:00:00 2001
From: Mariano Riefolo <rfmariano@protonmail.com>
Date: Fri, 16 Aug 2024 12:00:25 +0200
Subject: [PATCH] Wrote program for Day 22

https://github.com/LiveGray/100-Days-Of-Rust/issues/6
---
 README.md                                     |  2 +-
 .../day22/Cargo.toml                          |  6 +++++
 .../day22/src/lib.rs                          |  7 ++++++
 .../day22/src/main.rs                         | 22 +++++++++++++++++++
 .../day22/tests/example.rs                    |  9 ++++++++
 5 files changed, 45 insertions(+), 1 deletion(-)
 create mode 100644 Week-04/Day-22_Marcio-Mellos-Challenge/day22/Cargo.toml
 create mode 100644 Week-04/Day-22_Marcio-Mellos-Challenge/day22/src/lib.rs
 create mode 100644 Week-04/Day-22_Marcio-Mellos-Challenge/day22/src/main.rs
 create mode 100644 Week-04/Day-22_Marcio-Mellos-Challenge/day22/tests/example.rs

diff --git a/README.md b/README.md
index 7440fd2..8464510 100644
--- a/README.md
+++ b/README.md
@@ -68,7 +68,7 @@ We encourage you to share your progress and ask questions in the Discussions sec
 | Day #19       | [URL Shortener](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-03/Day-19_URL-Shortener)                         | :white_check_mark:      |
 | Day #20       | [API Challenge](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-03/Day-20_API-Challenge)                         | :white_check_mark:      |
 | Day #21       | [Random Maze Generator](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-03/Day-21_Random-Maze-Generator)                 | :white_check_mark:      |
-| Day #22       | [Marcio Mellos Challenge](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-22_Marcio-Mellos-Challenge)               | :white_large_square:      |
+| Day #22       | [Marcio Mellos Challenge](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-22_Marcio-Mellos-Challenge)               | :white_check_mark:      |
 | Day #23       | [The Dining Philosophers](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-23_The-Dining_Philosophers)               | :white_large_square:      |
 | Day #24       | [The Josephus Problem](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-24_The-Josephus-Problem)                  | :white_large_square:      |
 | Day #25       | [Coin Trouble](https://github.com/LiveGray/100-Days-Of-Rust/tree/main/Week-04/Day-25_Coin-Trouble)                          | :white_large_square:      |
diff --git a/Week-04/Day-22_Marcio-Mellos-Challenge/day22/Cargo.toml b/Week-04/Day-22_Marcio-Mellos-Challenge/day22/Cargo.toml
new file mode 100644
index 0000000..07fb531
--- /dev/null
+++ b/Week-04/Day-22_Marcio-Mellos-Challenge/day22/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "day22"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/Week-04/Day-22_Marcio-Mellos-Challenge/day22/src/lib.rs b/Week-04/Day-22_Marcio-Mellos-Challenge/day22/src/lib.rs
new file mode 100644
index 0000000..1654589
--- /dev/null
+++ b/Week-04/Day-22_Marcio-Mellos-Challenge/day22/src/lib.rs
@@ -0,0 +1,7 @@
+pub fn area_to_fields(area: f64) -> f64 {
+    let field_area = 105f64 * 68f64;
+    let area_m2 = area * 1000f64 * 1000f64;
+    let result = area_m2 / field_area;
+    let integer_result: usize = (result * 1000f64) as usize;
+    integer_result as f64 / 1000f64
+}
diff --git a/Week-04/Day-22_Marcio-Mellos-Challenge/day22/src/main.rs b/Week-04/Day-22_Marcio-Mellos-Challenge/day22/src/main.rs
new file mode 100644
index 0000000..ca44eda
--- /dev/null
+++ b/Week-04/Day-22_Marcio-Mellos-Challenge/day22/src/main.rs
@@ -0,0 +1,22 @@
+use std::io::{self, Write};
+
+use day22::area_to_fields;
+
+fn main() {
+    let mut buffer = String::new();
+
+    print!("Insert the deforested area in km2: ");
+    io::stdout().flush().expect("Failed to flush stdout");
+
+    io::stdin()
+        .read_line(&mut buffer)
+        .expect("Failed to read line");
+
+    let area = buffer.trim().parse().expect("The area must be an integer");
+
+    let fields = area_to_fields(area);
+    println!(
+        "{} km2 is equivalent to {:.3} football fields",
+        area, fields
+    );
+}
diff --git a/Week-04/Day-22_Marcio-Mellos-Challenge/day22/tests/example.rs b/Week-04/Day-22_Marcio-Mellos-Challenge/day22/tests/example.rs
new file mode 100644
index 0000000..bc14be8
--- /dev/null
+++ b/Week-04/Day-22_Marcio-Mellos-Challenge/day22/tests/example.rs
@@ -0,0 +1,9 @@
+#[cfg(test)]
+mod example {
+    use day22::area_to_fields;
+
+    #[test]
+    fn example() {
+        assert_eq!(area_to_fields(1.034), 144.817);
+    }
+}