From a32b04a623d13badac51ffeca9cc991033fc8001 Mon Sep 17 00:00:00 2001
From: Florian Fischer <florian.fl.fischer@fau.de>
Date: Sun, 9 Jun 2019 12:52:51 +0200
Subject: return error if distance is <= 0

---
 tanken.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tanken.py b/tanken.py
index a9468b0..2ca80bd 100644
--- a/tanken.py
+++ b/tanken.py
@@ -23,6 +23,8 @@ def tanken(drives, cost):
                 passengers[p][0] += d[0]
    
     # calculate cost per kilometer
+    if distance <= 0:
+        return None, "Driven distance must be greater than 0!"
     c = cost/distance
 
     for d in drives:
-- 
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