From 75375fe67a9985934bd7896b75171bdfde06f467 Mon Sep 17 00:00:00 2001
From: TMap Community <41735642+tmapcommunity@users.noreply.github.com>
Date: Mon, 8 Mar 2021 08:22:11 +0100
Subject: [PATCH 1/2] Subtract_feature file added

---
 src/service/subtract_service.py | 6 ++++++
 1 file changed, 6 insertions(+)
 create mode 100644 src/service/subtract_service.py

diff --git a/src/service/subtract_service.py b/src/service/subtract_service.py
new file mode 100644
index 0000000..7fd90f0
--- /dev/null
+++ b/src/service/subtract_service.py
@@ -0,0 +1,6 @@
+
+
+def add(string):
+    arguments = string.split("-")
+    result = int(arguments[0]) - int(arguments[1])
+    return result

From 6cef9e0ba0c1acd83730ae0ea64747a0837e6164 Mon Sep 17 00:00:00 2001
From: TMap Community <41735642+tmapcommunity@users.noreply.github.com>
Date: Mon, 8 Mar 2021 08:25:11 +0100
Subject: [PATCH 2/2] Update calculation_service.py

---
 src/service/calculation_service.py | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/service/calculation_service.py b/src/service/calculation_service.py
index 4b3e905..bf9c07c 100644
--- a/src/service/calculation_service.py
+++ b/src/service/calculation_service.py
@@ -1,6 +1,7 @@
 """Module for the CalculationService class"""
 from tkinter import StringVar
 import divide_service as divide_service
+import subtract_service as subtract_service
 
 
 class CalculationService:
@@ -29,10 +30,12 @@ def equalpress(self):
         try:
 
             # evaluate the expression/calculation
-            if "/" not in self.expression:
-                total = str(eval(self.expression))
-            else:
+            if "/" in self.expression:
                 total = str(divide_service.divide(self.expression))
+            if "-" in self.expression:
+                total = str(subtract_service.subtract(self.expression))
+            else:
+                total = str(eval(self.expression))
 
             if float(total) > 10:
                 total = total + " <:o)"