Update app.py

app.py

@@ -22,8 +22,8 @@ st.markdown("<h5 style='text-align:center; font-size:24px;'>Mathematical and Str
 radio_bar = st.radio(options=[description1, description2, description3, description4, description5, description6, description7, description8, description9], label="Select any one:")
 if radio_bar == description1:
     form1 = st.form("")
-    first_num = form1.number_input(label="Enter First Number")
-    second_num = form1.number_input(label="Enter Second Number")
+    first_num = form1.number_input(label="Enter First Number",value=None)
+    second_num = form1.number_input(label="Enter Second Number",value=None)
     if form1.button("Calculate result"):
         result = sum_of_two(first_num,second_num)
-    st.success(f"Answer = {result}")
+        st.success(f"Answer = {result}")