From 370df33a6c6167ad8e0fcf2be91fd66b6f6e19f8 Mon Sep 17 00:00:00 2001
From: Mirko Scholz <srtlg@users.noreply.github.com>
Date: Thu, 10 Sep 2020 16:42:32 +0200
Subject: [PATCH] implemented roll up

---
 src/calc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/calc.c b/src/calc.c
index 6d50bf0..69387be 100644
--- a/src/calc.c
+++ b/src/calc.c
@@ -238,6 +238,8 @@ void process_cmd(char cmd){
 		case '4':{
 			if (IsShiftedUp){ //roll down
 				StackPtr++;
+			} else if (IsShiftedDown){ //roll up
+				StackPtr--;
 			}
 		} break;
 		//////////