Create app.py

app.py

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+import streamlit as st
+import math
+
+# App title
+st.set_page_config(page_title="Advanced Calculator", page_icon="🧮")
+st.title("🧮 Advanced Calculator")
+st.write("An advanced calculator with percentage & history")
+
+# Initialize history in session state
+if "history" not in st.session_state:
+    st.session_state.history = []
+
+# Select operation
+operation = st.selectbox(
+    "Choose an operation",
+    [
+        "Addition (+)",
+        "Subtraction (-)",
+        "Multiplication (*)",
+        "Division (/)",
+        "Power (x^y)",
+        "Modulus (%)",
+        "Square Root (√x)",
+        "Percentage (x % of y)"
+    ]
+)
+
+# Inputs
+if operation == "Square Root (√x)":
+    num = st.number_input("Enter number", value=0.0)
+
+elif operation == "Percentage (x % of y)":
+    x = st.number_input("Enter percentage value", value=0.0)
+    y = st.number_input("Enter total value", value=0.0)
+
+else:
+    num1 = st.number_input("Enter first number", value=0.0)
+    num2 = st.number_input("Enter second number", value=0.0)
+
+# Calculate button
+if st.button("Calculate"):
+    try:
+        if operation == "Addition (+)":
+            result = num1 + num2
+            record = f"{num1} + {num2} = {result}"
+
+        elif operation == "Subtraction (-)":
+            result = num1 - num2
+            record = f"{num1} - {num2} = {result}"
+
+        elif operation == "Multiplication (*)":
+            result = num1 * num2
+            record = f"{num1} * {num2} = {result}"
+
+        elif operation == "Division (/)":
+            if num2 == 0:
+                st.error("Division by zero is not allowed")
+                st.stop()
+            result = num1 / num2
+            record = f"{num1} / {num2} = {result}"
+
+        elif operation == "Power (x^y)":
+            result = num1 ** num2
+            record = f"{num1} ^ {num2} = {result}"
+
+        elif operation == "Modulus (%)":
+            result = num1 % num2
+            record = f"{num1} % {num2} = {result}"
+
+        elif operation == "Square Root (√x)":
+            if num < 0:
+                st.error("Cannot calculate square root of negative number")
+                st.stop()
+            result = math.sqrt(num)
+            record = f"√{num} = {result}"
+
+        elif operation == "Percentage (x % of y)":
+            result = (x / 100) * y
+            record = f"{x}% of {y} = {result}"
+
+        # Display result
+        st.success(f"Result: {result}")
+
+        # Save history
+        st.session_state.history.append(record)
+
+    except Exception as e:
+        st.error(f"Error: {e}")
+
+# Show history
+st.subheader("📜 Calculation History")
+if st.session_state.history:
+    for h in st.session_state.history:
+        st.write(h)
+else:
+    st.info("No calculations yet")