udpated app.py with new calc code

app.py

@@ -1,7 +1,23 @@
 import gradio as gr
 
-def greet(name):
-    return "Hello " + name + "!!"
+def calculator(input_str):
+    try:
+        result = eval(input_str)
+        return result
+    except ZeroDivisionError:
+        return "Division by zero error"
+    except Exception as e:
+        return f"Error: {str(e)}"
 
-demo = gr.Interface(fn=greet, inputs="text", outputs="text here")
-demo.launch()
+# Create the Gradio interface
+interface = gr.Interface(
+    fn=calculator,
+    inputs=gr.inputs.Textbox(lines=2, placeholder="Enter calculation (e.g., 3 + 5 * 2)", label="Calculator Input"),
+    outputs="text",
+    title="Simple Calculator",
+    description="Enter a mathematical expression to calculate the result."
+)
+
+# Launch the app
+if __name__ == "__main__":
+    interface.launch()