diff --git a/src/main/c/BasicMode.c b/src/main/c/BasicMode.c
index 95879f0..da2431d 100644
--- a/src/main/c/BasicMode.c
+++ b/src/main/c/BasicMode.c
@@ -2,7 +2,7 @@
 #include <string.h>
 #include <stdlib.h>
 #include <math.h>
-#include "BasicMode"
+#include "BasicMode.h"
 
 
 // convert decimal to binary
@@ -42,6 +42,16 @@ long long int addition(long long int a, long long int b) {
 
     return dec2;
 }
+// multiplication
+long long int multiplication(long long int a, long long int b) {
+    long long int dec1, dec2;
+    dec1 = BinToDec(a);
+    dec2 = BinToDec(b);
+    dec1 = dec1 * dec2;
+    dec2 = DecToBin(dec1);
+
+    return dec2;
+}
 
 int main() {