Update app.py

app.py

@@ -1,82 +1,50 @@
 import streamlit as st
-import math
 
-# ---------------- Functions ---------------- #
-def add(a, b):
-    return a + b
+st.set_page_config(page_title="Button Calculator", page_icon="🧮")
 
-def subtract(a, b):
-    return a - b
+st.title("🧮 Smart Calculator")
 
-def multiply(a, b):
-    return a * b
+# Initialize session state
+if "expression" not in st.session_state:
+    st.session_state.expression = ""
 
-def divide(a, b):
-    if b == 0:
-        return "❌ Division by zero"
-    return a / b
-
-def power(a, b):
-    return a ** b
-
-def modulus(a, b):
-    return a % b
-
-# ---------------- UI ---------------- #
-st.set_page_config(page_title="Advanced Calculator", page_icon="🧮")
-
-st.title("🧮 Advanced Calculator App")
-st.write("Built with **Streamlit** | Ready for **Hugging Face Spaces** 🚀")
-
-# Operation selection
-operation = st.selectbox(
-    "Select Operation",
-    [
-        "Addition (+)",
-        "Subtraction (-)",
-        "Multiplication (*)",
-        "Division (/)",
-        "Power (**)",
-        "Modulus (%)",
-        "Square Root (√)",
-        "Logarithm (log)"
-    ]
+# Display
+st.text_input(
+    "Display",
+    st.session_state.expression,
+    disabled=True,
+    label_visibility="collapsed"
 )
 
-# Inputs
-num1 = st.number_input("Enter first number", value=0.0)
-
-num2 = None
-if operation not in ["Square Root (√)", "Logarithm (log)"]:
-    num2 = st.number_input("Enter second number", value=0.0)
-
-# Calculate button
-if st.button("Calculate"):
-    if operation == "Addition (+)":
-        result = add(num1, num2)
-    elif operation == "Subtraction (-)":
-        result = subtract(num1, num2)
-    elif operation == "Multiplication (*)":
-        result = multiply(num1, num2)
-    elif operation == "Division (/)":
-        result = divide(num1, num2)
-    elif operation == "Power (**)":
-        result = power(num1, num2)
-    elif operation == "Modulus (%)":
-        result = modulus(num1, num2)
-    elif operation == "Square Root (√)":
-        if num1 < 0:
-            result = "❌ Cannot take square root of negative number"
-        else:
-            result = math.sqrt(num1)
-    elif operation == "Logarithm (log)":
-        if num1 <= 0:
-            result = "❌ Logarithm undefined for ≤ 0"
-        else:
-            result = math.log10(num1)
-
-    st.success(f"Result: {result}")
+# Button handler
+def press(key):
+    if key == "C":
+        st.session_state.expression = ""
+    elif key == "=":
+        try:
+            st.session_state.expression = str(
+                eval(st.session_state.expression)
+            )
+        except:
+            st.session_state.expression = "Error"
+    else:
+        st.session_state.expression += key
+
+# Layout buttons
+buttons = [
+    ["7", "8", "9", "/"],
+    ["4", "5", "6", "*"],
+    ["1", "2", "3", "-"],
+    ["0", ".", "=", "+"],
+    ["C"]
+]
+
+for row in buttons:
+    cols = st.columns(len(row))
+    for i, btn in enumerate(row):
+        if cols[i].button(btn, use_container_width=True):
+            press(btn)
 
 # Footer
 st.markdown("---")
-st.caption("✨ Made with Python & Streamlit")
+st.caption("📱 Smartphone-style calculator using Streamlit")