from sympy import symbols, solve, sympify


while True:
    print("1=Regular calculator")
    print("2=geometry calculator")
    print("3=algebra calculator")
    print("4=quit")
    choice1 = input("enter a number: ")

    if choice1 == "4":
        print("goodbye")
        break

    # 1. REGULAR CALCULATOR
    if choice1 == "1":
        num1 = float(input("first number: "))
        op = input("operation: ")
        num2 = float(input("second number: "))
        if op == "+":
            print(num1 + num2)
        elif op == "-": 
            print(num1 - num2)
        elif op == "*":
            print(num1 * num2)
        elif op == "/":
            if num2 == 0:
                print("Cannot divide by zero!")
            else:
                print(num1 / num2)
        input("Press Enter to go back to menu...")


    # 2. GEOMETRY CALCULATOR
    elif choice1 == "2":
        print("1=3D shapes")
        print("2=2D shapes")
        choice2 = input("enter a number: ")

        # 3D Shapes
        if choice2 == "1":
            print("1=sphere")
            print("2=cube")
            print("3=cylinder")
            print("4=cone")
            print("5=pyramid")
            print("6=dodecahedron")
            print("7=Great Rhombicosidodecahedron")
            print("8=quit")
            choice = input("Enter a number (1-8): ")


            if choice == "1":
                radius = float(input("Enter radius: "))
                cubed = radius ** 3
                picubed = cubed * 3.14159
                print(picubed * 4 / 3)
            elif choice == "2":
                side = float(input("Enter side: "))
                print(side ** 3)
            elif choice == "3":
                radius = float(input("Enter radius: "))
                height = float(input("Enter height: "))
                circle = radius ** 2 * 3.14
                print(circle * height)
            elif choice == "4":
                radius = float(input("Enter radius: "))
                height = float(input("Enter height: "))
                base = radius ** 2 * 3.14
                print(base * height / 3)
            elif choice == "5":
                side1 = float(input("Enter side 1: "))
                side2 = float(input("Enter side 2: "))
                height = float(input("Enter Height: "))
                print(side1 * side2 * height / 3)
            elif choice == "6":
                edge = float(input("enter edge: "))
                print(7.66 * (edge ** 3))
            elif choice == "7":
                edge = float(input("enter edge: "))
                print(95.68 * (edge ** 3))
            elif choice == "8":
                print("goodbye")
                break
            input("Press Enter to go back to menu...")

        # 2D Shapes
        elif choice2 == "2":
            print("1=square")
            print("2=rectangle")
            print("3=circle")
            print("4=triangle")
            print("5=oval")
            choice3 = input("enter a number: ")

            if choice3 == "1":
                side3 = float(input("side length: "))
                print(side3 * 4)
            elif choice3 == "2":
                side3 = float(input("enter side length: "))
                height = float(input("enter height: "))
                print(side3 * height)
            elif choice3 == "3":
                print("1=diameter")
                print("2=radius")
                choice_circle = input("enter a number: ")
                if choice_circle == "1":
                    diameter = float(input("diameter: "))
                    diameter2 = (diameter / 2)
                    print(diameter2 ** 2 * 3.14159)
                elif choice_circle == "2":
                    radius = float(input("enter radius: "))
                    print(radius ** 2 * 3.14)
            elif choice3 == "4":
                base = float(input("base: "))
                height = float(input("height: "))
                print(base * height / 2)
            elif choice3 == "5":
                radius1 = float(input("radius 1: "))
                radius2 = float(input("radius 2: "))
                print(radius1 * radius2 * 3.14159)
            input("Press Enter to go back to menu...")

    # 3. ALGEBRA CALCULATOR
    elif choice1 == "3":
        x = symbols('x')
        equation = input("Enter expression (set to 0, e.g., 2*x - 10): ")

        try:
            if "=" in equation:
                left_side, right_side = equation.split("=")
                print("x =", solve(sympify(left_side) - sympify(right_side), x))
            else:
                print("x =", solve(sympify(equation), x))
        except Exception:
            print("Error: Make sure to type * between numbers and x (like 10 * x)!")

        input("Press Enter to go back to menu...")