Well-definedness check for GCD

1 files changed, 2 insertions, 0 deletions

diff --git a/08/src/stuff.rs b/08/src/stuff.rs
index 7e88605..e526858 100644
--- a/08/src/stuff.rs
+++ b/08/src/stuff.rs
@@ -45,6 +45,8 @@ pub fn gcd(mut m: u64, mut n: u64) -> u64 {
     if m < n {
         std::mem::swap(&mut m, &mut n);
     }
+
+    if m == 0 { panic!("gcd(0,0) is undefined"); }
     
     while n > 0 {
         let r: u64 = m % n;