diff --git a/Chapter 6/Exercise 6.3 b/Chapter 6/Exercise 6.3
new file mode 100644
index 0000000..f5aeb4f
--- /dev/null
+++ b/Chapter 6/Exercise 6.3	
@@ -0,0 +1,11 @@
+const val1 = 10;
+const val2 = 5;
+let operat = "-";
+function cal(a, b, op) {
+  if (op == "-") {
+    console.log(a — b);
+  } else {
+    console.log(a + b);
+  }
+}
+cal(val1, val2, operat);