diff --git a/calc/calc.py b/calc/calc.py
new file mode 100644
index 0000000..42a98a6
--- /dev/null
+++ b/calc/calc.py
@@ -0,0 +1,66 @@
+# This function adds two numbers
+def add(x, y):
+    return x + y
+
+# This function subtracts two numbers
+def subtract(x, y):
+    return x - y
+
+# This function multiplies two numbers
+def multiply(x, y):
+    return x * y
+
+# This function divides two numbers
+def divide(x, y):
+    if y == 0:
+        raise ValueError("Cannot divide by zero")
+    return x / y
+
+OPERATIONS = {
+    '1': (add, '+'),
+    '2': (subtract, '-'),
+    '3': (multiply, '*'),
+    '4': (divide, '/'),
+}
+
+def main():
+    print("""Select operation.
+    1.Add
+    2.Subtract
+    3.Multiply
+    4.Divide""")
+    
+    while True:
+        # take input from the user
+        choice = input("Enter choice(1/2/3/4): ")
+    
+        # check if the choice is one of the four options
+        if choice in ('1', '2', '3', '4'):
+            try:
+                num1 = float(input("Enter first number: "))
+                num2 = float(input("Enter second number: "))
+            except ValueError:
+                print("Invalid input. Please enter a number.")
+                continue
+    
+            func, operator = OPERATIONS[choice]
+            try:
+                print(num1, operator, num2, "=", func(num1, num2))
+            except ValueError as e:
+                print(f"Error: {e}")
+                continue
+                
+            # check if the user wants another calculation
+            # break the while loop if answer is no
+            while True:
+                next_calculation = input("Let's do next calculation? (yes/no): ").lower()
+                if next_calculation in ["yes", "no"]:
+                    break
+            if next_calculation == "no":
+                break
+                
+        else:
+            print("Invalid Input. Please select 1, 2, 3, or 4.")
+
+if __name__ == "__main__":
+    main()