From 3327f43798105ec3977e7536b20dab1abdc59539 Mon Sep 17 00:00:00 2001
From: xiaowei-zhang <xiaowei.zhang124@gmail.com>
Date: Fri, 3 Apr 2020 15:21:14 +0200
Subject: [PATCH] Accurate error messages

Add one more condition to trigger accurate error messages
---
 .../scala/scalatutorial/sections/ImperativeProgramming.scala  | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/scala/scalatutorial/sections/ImperativeProgramming.scala b/src/main/scala/scalatutorial/sections/ImperativeProgramming.scala
index 1323496f..5154f9cf 100644
--- a/src/main/scala/scalatutorial/sections/ImperativeProgramming.scala
+++ b/src/main/scala/scalatutorial/sections/ImperativeProgramming.scala
@@ -115,9 +115,11 @@ object ImperativeProgramming extends ScalaTutorialSection {
    *       balance
    *     }
    *     def withdraw(amount: Int): Int =
-   *       if (0 < amount && amount <= balance) {
+   *       if (0 <= amount && amount <= balance) {
    *         balance = balance - amount
    *         balance
+   *       } else if (amount < 0) {
+   *         throw new Error("invalid withdraw amount")
    *       } else throw new Error("insufficient funds")
    *   }
    * }}}