diff --git a/src/main/c/BasicMode.h b/src/main/c/BasicMode.h
index 454f8ac..43a3522 100644
--- a/src/main/c/BasicMode.h
+++ b/src/main/c/BasicMode.h
@@ -4,6 +4,7 @@
 long long int DecToBin(long long int n);
 long long int BinToDec(long long int n);
 long long int addition(long long int a, long long int b);
+long long int multiplication(long long int a, long long int b);