diff --git a/src/main/c/main_taschenrechner.c b/src/main/c/main_taschenrechner.c
index fe59f96..e365a95 100644
--- a/src/main/c/main_taschenrechner.c
+++ b/src/main/c/main_taschenrechner.c
@@ -62,6 +62,11 @@ double exponentialFunction(double x) {
     return exp(x);
 }
 
+// ..
+// Bitwise AND function
+int bitwiseAND(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 17f2ce2..866141a 100644
--- a/src/main/c/taschenrechner.h
+++ b/src/main/c/taschenrechner.h
@@ -28,6 +28,10 @@ double logarithmBase2Function(double x);
 // Exponential function
 double exponentialFunction(double x);
 
+// ..
+// Bitwise AND function
+int bitwiseAND(int num1, int num2);
+
 int mode(int userChoice);
 
 int displayMenu();