Create app.py

app.py

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+import streamlit as st
+import math
+
+st.set_page_config(page_title="Advanced Calculator", page_icon="🧮")
+
+st.title("🧮 Advanced Calculator")
+st.write("A simple and powerful calculator built with Streamlit")
+
+# Sidebar for mode selection
+mode = st.sidebar.selectbox(
+    "Select Calculator Mode",
+    ["Basic", "Scientific", "Expression"]
+)
+
+# ---------------- BASIC CALCULATOR ----------------
+if mode == "Basic":
+    st.subheader("Basic Calculator")
+
+    num1 = st.number_input("Enter first number", value=0.0)
+    num2 = st.number_input("Enter second number", value=0.0)
+
+    operation = st.selectbox(
+        "Choose operation",
+        ["+", "-", "*", "/", "**", "%"]
+    )
+
+    if st.button("Calculate"):
+        try:
+            if operation == "+":
+                result = num1 + num2
+            elif operation == "-":
+                result = num1 - num2
+            elif operation == "*":
+                result = num1 * num2
+            elif operation == "/":
+                if num2 == 0:
+                    st.error("Division by zero is not allowed")
+                    result = None
+                else:
+                    result = num1 / num2
+            elif operation == "**":
+                result = num1 ** num2
+            elif operation == "%":
+                result = num1 % num2
+
+            if result is not None:
+                st.success(f"Result: {result}")
+
+        except Exception as e:
+            st.error("Something went wrong")
+
+# ---------------- SCIENTIFIC CALCULATOR ----------------
+elif mode == "Scientific":
+    st.subheader("Scientific Calculator")
+
+    number = st.number_input("Enter a number", value=0.0)
+
+    operation = st.selectbox(
+        "Choose function",
+        ["sin", "cos", "tan", "sqrt", "log", "exp"]
+    )
+
+    if st.button("Calculate"):
+        try:
+            if operation == "sin":
+                result = math.sin(math.radians(number))
+            elif operation == "cos":
+                result = math.cos(math.radians(number))
+            elif operation == "tan":
+                result = math.tan(math.radians(number))
+            elif operation == "sqrt":
+                if number < 0:
+                    st.error("Cannot calculate square root of negative number")
+                    result = None
+                else:
+                    result = math.sqrt(number)
+            elif operation == "log":
+                if number <= 0:
+                    st.error("Logarithm input must be positive")
+                    result = None
+                else:
+                    result = math.log(number)
+            elif operation == "exp":
+                result = math.exp(number)
+
+            if result is not None:
+                st.success(f"Result: {result}")
+
+        except Exception:
+            st.error("Invalid calculation")
+
+# ---------------- EXPRESSION CALCULATOR ----------------
+elif mode == "Expression":
+    st.subheader("Expression Calculator")
+    st.write("Example: `3 + 5 * (2 - 1) ** 2`")
+
+    expression = st.text_input("Enter expression")
+
+    if st.button("Evaluate"):
+        try:
+            allowed_chars = "0123456789+-*/().% "
+            if all(char in allowed_chars for char in expression):
+                result = eval(expression)
+                st.success(f"Result: {result}")
+            else:
+                st.error("Invalid characters in expression")
+
+        except Exception:
+            st.error("Invalid expression")
+
+st.markdown("---")
+st.caption("Built with Streamlit • Deployable on Hugging Face Spaces")