From: Alexis Laferrière <alexis.laf@xymus.net>
Date: Wed, 11 May 2016 18:13:34 +0000 (-0400)
Subject: calculator: implement unary minus
X-Git-Url: http://nitlanguage.org

calculator: implement unary minus

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
---

diff --git a/examples/calculator/src/calculator_logic.nit b/examples/calculator/src/calculator_logic.nit
index 775e8e3..840ed84 100644
--- a/examples/calculator/src/calculator_logic.nit
+++ b/examples/calculator/src/calculator_logic.nit
@@ -79,6 +79,17 @@ class CalculatorContext
 		else if op == "C" then
 			clear
 			return
+
+		# Unary -
+		else if op == "-" then
+			if current == null then
+				if last_op_was_unary then clear
+				current = "-"
+				return
+			else if current == "-" then
+				current = null
+				return
+			end
 		end
 
 		# For all operators, apply pending operators