diff --git a/Elena_Chen_TakeInData/Elena_Chen_TakeInData/Source.cpp b/Elena_Chen_TakeInData/Elena_Chen_TakeInData/Source.cpp
index 3bdabe9..ea1a25c 100644
--- a/Elena_Chen_TakeInData/Elena_Chen_TakeInData/Source.cpp
+++ b/Elena_Chen_TakeInData/Elena_Chen_TakeInData/Source.cpp
@@ -54,4 +54,5 @@ void main() {
 	cout << calc_3 << "-" << calc_4 << "=" << calc_3 - calc_4 << endl;
 	cout << calc_4 << "/" << calc_1 << "=" << calc_4 / calc_1 << endl;
 	pause();
-}
\ No newline at end of file
+}
+//create a condition that checks for invalid inputs