Update app.py

app.py

@@ -67,4 +67,44 @@ elif operation == "Trigonometric":
 
 # Logarithmic Operations
 elif operation == "Logarithmic":
-    log_op = st.selectbox("Choose logarithmic operation", 
+    log_op = st.selectbox("Choose logarithmic operation", ("Log Base 10", "Natural Log"))
+    if log_op == "Log Base 10":
+        if num1 > 0:
+            result = math.log10(num1)
+        else:
+            result = "Error: Logarithm only defined for positive numbers"
+    elif log_op == "Natural Log":
+        if num1 > 0:
+            result = math.log(num1)
+        else:
+            result = "Error: Logarithm only defined for positive numbers"
+
+# Factorial
+elif operation == "Factorial":
+    if num1 >= 0 and num1 == int(num1):
+        result = math.factorial(int(num1))
+    else:
+        result = "Error: Factorial is only defined for non-negative integers"
+
+# Percentage Calculation
+elif operation == "Percentage":
+    percentage_op = st.selectbox("Choose percentage operation", ("Find Percentage", "Find Percentage of"))
+    if percentage_op == "Find Percentage":
+        result = (num1 * num2) / 100
+    elif percentage_op == "Find Percentage of":
+        result = (num1 * 100) / num2
+
+# Memory Feature
+elif operation == "Memory":
+    memory_op = st.selectbox("Choose memory operation", ("Store Result", "Recall Result", "Clear Memory"))
+    if memory_op == "Store Result":
+        st.session_state.memory = result
+        result = f"Result stored in memory: {st.session_state.memory}"
+    elif memory_op == "Recall Result":
+        result = f"Memory contains: {st.session_state.memory}"
+    elif memory_op == "Clear Memory":
+        st.session_state.memory = 0.0
+        result = "Memory cleared"
+
+# Display the result
+st.write(f"Result: {result}")