1 files changed, 36 insertions, 0 deletions
diff --git a/azalea-core/src/lib.rs b/azalea-core/src/lib.rs
index 66d9a2ea..f7726a38 100755
--- a/azalea-core/src/lib.rs
+++ b/azalea-core/src/lib.rs
@@ -64,3 +64,39 @@ pub fn binary_search(mut min: i32, max: i32, predicate: &dyn Fn(i32) -> bool) ->
 
     min
 }
+
+pub fn lcm(a: u32, b: u32) -> u64 {
+    let gcd = gcd(a, b);
+    (a as u64) * (b / gcd) as u64
+}
+pub fn gcd(mut a: u32, mut b: u32) -> u32 {
+    while b != 0 {
+        let t = b;
+        b = a % b;
+        a = t;
+    }
+    a
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_gcd() {
+        assert_eq!(gcd(0, 0), 0);
+        assert_eq!(gcd(1, 1), 1);
+
+        assert_eq!(gcd(0, 1), 1);
+        assert_eq!(gcd(1, 0), 1);
+
+        assert_eq!(gcd(12, 8), 4);
+        assert_eq!(gcd(8, 12), 4);
+
+        assert_eq!(gcd(12, 9), 3);
+        assert_eq!(gcd(9, 12), 3);
+
+        assert_eq!(gcd(12, 7), 1);
+        assert_eq!(gcd(7, 12), 1);
+    }
+}