From 9abbfa7862cca5daf368bf2af424a09c3851f416 Mon Sep 17 00:00:00 2001
From: ath3 <45574139+ath3@users.noreply.github.com>
Date: Wed, 30 Oct 2019 12:54:38 +0100
Subject: [PATCH] examples/fibonacci: stop before overflowing and use u64

---
 examples/fibonacci.v | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/examples/fibonacci.v b/examples/fibonacci.v
index 3cef7cb02f..5976fef4cf 100644
--- a/examples/fibonacci.v
+++ b/examples/fibonacci.v
@@ -14,10 +14,16 @@ fn main() {
 	// Parse first argument and cast it to int
 	stop := os.args[1].int()
 
+	// Can only calculate correctly until rank 92
+	if stop > 92 {
+		println('rank must be 92 or less')
+		return
+	}
+
 	// Three consecutive terms of the sequence
-	mut a := i64(0)
-	mut b := i64(0)
-	mut c := i64(1)
+	mut a := u64(0)
+	mut b := u64(0)
+	mut c := u64(1)
 
 	for i := 0; i < stop; i++ {
 		// Set a and b to the next term