From 2027871010cf1293292da8f6a4c150d8b57065b8 Mon Sep 17 00:00:00 2001
From: Mariano <rfmariano@protonmail.com>
Date: Wed, 31 Jul 2024 21:14:40 +0200
Subject: [PATCH] Wrote program for Day 6

---
 .../Day-06_Next-Prime/next_prime/Cargo.toml   |  6 +++++
 .../Day-06_Next-Prime/next_prime/src/lib.rs   | 16 +++++++++++++
 .../Day-06_Next-Prime/next_prime/src/main.rs  | 23 +++++++++++++++++++
 .../next_prime/tests/exaples.rs               | 16 +++++++++++++
 4 files changed, 61 insertions(+)
 create mode 100644 Week-01/Day-06_Next-Prime/next_prime/Cargo.toml
 create mode 100644 Week-01/Day-06_Next-Prime/next_prime/src/lib.rs
 create mode 100644 Week-01/Day-06_Next-Prime/next_prime/src/main.rs
 create mode 100644 Week-01/Day-06_Next-Prime/next_prime/tests/exaples.rs

diff --git a/Week-01/Day-06_Next-Prime/next_prime/Cargo.toml b/Week-01/Day-06_Next-Prime/next_prime/Cargo.toml
new file mode 100644
index 0000000..a854f01
--- /dev/null
+++ b/Week-01/Day-06_Next-Prime/next_prime/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "next_prime"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/Week-01/Day-06_Next-Prime/next_prime/src/lib.rs b/Week-01/Day-06_Next-Prime/next_prime/src/lib.rs
new file mode 100644
index 0000000..27fa4a5
--- /dev/null
+++ b/Week-01/Day-06_Next-Prime/next_prime/src/lib.rs
@@ -0,0 +1,16 @@
+pub fn next_prime(num: usize) -> Option<usize> {
+    let max_next_prime = num * 2;
+    let mut is_prime: Vec<bool> = vec![true; max_next_prime];
+
+    for i in 2..max_next_prime {
+        for j in (i * 2..max_next_prime).step_by(i) {
+            is_prime[j] = false;
+        }
+
+        if i >= num && is_prime[i] {
+            return Some(i);
+        }
+    }
+
+    None
+}
diff --git a/Week-01/Day-06_Next-Prime/next_prime/src/main.rs b/Week-01/Day-06_Next-Prime/next_prime/src/main.rs
new file mode 100644
index 0000000..9330f5a
--- /dev/null
+++ b/Week-01/Day-06_Next-Prime/next_prime/src/main.rs
@@ -0,0 +1,23 @@
+use next_prime::next_prime;
+use std::io::{self, Write};
+
+fn main() {
+    let mut buffer = String::new();
+
+    print!("Give me an integer, and I will return the first prime found from that: ");
+    io::stdout().flush().expect("Failed to flush stdout.");
+
+    io::stdin()
+        .read_line(&mut buffer)
+        .expect("Error while trying to read the number.");
+
+    let num: usize = buffer
+        .trim()
+        .parse()
+        .expect("The input inserted is not a valid integer");
+
+    match next_prime(num) {
+        Some(x) => println!("Here's the first prime found from {}: {}", num, x),
+        None => println!("None found"),
+    }
+}
diff --git a/Week-01/Day-06_Next-Prime/next_prime/tests/exaples.rs b/Week-01/Day-06_Next-Prime/next_prime/tests/exaples.rs
new file mode 100644
index 0000000..567b4a5
--- /dev/null
+++ b/Week-01/Day-06_Next-Prime/next_prime/tests/exaples.rs
@@ -0,0 +1,16 @@
+use next_prime::next_prime;
+
+#[test]
+fn first_example() {
+    assert_eq!(next_prime(12), Some(13));
+}
+
+#[test]
+fn second_example() {
+    assert_eq!(next_prime(24), Some(29));
+}
+
+#[test]
+fn third_example() {
+    assert_eq!(next_prime(11), Some(11));
+}