# Interactive Python Calculator program.
# Allows users to input a maths expression then prints out the answer.
# Include in a loop to perform many equations.

def exercise11():
    calculate = True
    user_input = ""

    while calculate == True:
        user_input = eval(input("Maths Expression: "))

        if user_input == "":
            calculate = False
        else:
            print(user_input)