Add simple calculator program

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

exercise.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+"""
+Simple calculator program for two numbers.
+Supports addition, subtraction, multiplication, and division.
+"""
+
+def calculator():
+    """Main calculator function."""
+    print("Simple Calculator")
+    print("Operations: + (addition), - (subtraction), * (multiplication), / (division)")
+
+    try:
+        # Get input from user
+        num1 = float(input("Enter first number: "))
+        num2 = float(input("Enter second number: "))
+        operation = input("Enter operation (+, -, *, /): ").strip()
+
+        # Perform calculation
+        if operation == '+':
+            result = num1 + num2
+            print(f"{num1} + {num2} = {result}")
+        elif operation == '-':
+            result = num1 - num2
+            print(f"{num1} - {num2} = {result}")
+        elif operation == '*':
+            result = num1 * num2
+            print(f"{num1} * {num2} = {result}")
+        elif operation == '/':
+            if num2 == 0:
+                print("Error: Division by zero!")
+            else:
+                result = num1 / num2
+                print(f"{num1} / {num2} = {result}")
+        else:
+            print("Invalid operation! Please use +, -, *, or /.")
+
+    except ValueError:
+        print("Invalid input! Please enter numeric values.")
+    except Exception as e:
+        print(f"An error occurred: {e}")
+
+if __name__ == "__main__":
+    calculator()