Create calculator

calculator

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+import math
+
+def calculator():
+    print("Select operation:")
+    print("1. Add")
+    print("2. Subtract")
+    print("3. Multiply")
+    print("4. Divide")
+    print("5. Square root")
+    print("6. Natural logarithm")
+    print("7. Exponential")
+    print("8. Trigonometric functions (sin, cos, tan)")
+    print("9. Inverse trigonometric functions (sin^-1, cos^-1, tan^-1)")
+
+    choice = input("Enter the number of the operation you want to perform: ")
+
+    num1 = float(input("Enter first number: "))
+    num2 = float(input("Enter second number: "))
+
+    if choice == '1':
+        print(num1, "+", num2, "=", num1 + num2)
+
+    elif choice == '2':
+        print(num1, "-", num2, "=", num1 - num2)
+
+    elif choice == '3':
+        print(num1, "*", num2, "=", num1 * num2)
+
+    elif choice == '4':
+        if num2 != 0:
+            print(num1, "/", num2, "=", num1 / num2)
+        else:
+            print("Error! Division by zero is not allowed.")
+
+    elif choice == '5':
+        if num1 >= 0:
+            print("Square root of", num1, "=", math.sqrt(num1))
+        else:
+            print("Error! Negative number doesn't have a real square root.")
+
+    elif choice == '6':
+        if num1 > 0:
+            print("Natural logarithm of", num1, "=", math.log(num1))
+        else:
+            print("Error! Logarithm of non-positive number is undefined.")
+
+    elif choice == '7':
+        print("Exponential of", num1, "=", math.exp(num1))
+
+    elif choice == '8':
+        print("Sine of", num1, "=", math.sin(num1))
+        print("Cosine of", num1, "=", math.cos(num1))
+        print("Tangent of", num1, "=", math.tan(num1))
+
+    elif choice == '9':
+        print("Inverse sine of", num1, "=", math.asin(num1))
+        print("Inverse cosine of", num1, "=", math.acos(num1))
+        print("Inverse tangent of", num1, "=", math.atan(num1))
+
+    else:
+        print("Invalid input")
+
+calculator()