diff --git a/src/main/c/main_taschenrechner.c b/src/main/c/main_taschenrechner.c
index e365a95..e0bb699 100644
--- a/src/main/c/main_taschenrechner.c
+++ b/src/main/c/main_taschenrechner.c
@@ -68,6 +68,12 @@ int bitwiseAND(int num1, int num2) {
     return num1 & num2;
 }
 
+// Bitwise OR function
+int bitwiseOR(int num1, int num2) {
+    return num1 | num2;
+}
+
+
 // scientificmode
 int scientificMode(){
 
diff --git a/src/main/c/taschenrechner.h b/src/main/c/taschenrechner.h
index 866141a..b3cc747 100644
--- a/src/main/c/taschenrechner.h
+++ b/src/main/c/taschenrechner.h
@@ -32,6 +32,9 @@ double exponentialFunction(double x);
 // Bitwise AND function
 int bitwiseAND(int num1, int num2);
 
+// Bitwise OR function
+int bitwiseOR(int num1, int num2);
+
 int mode(int userChoice);
 
 int displayMenu();