contract flipper {
    bool private value;

    /// Constructor that initializes the `bool` value to the given `init_value`.
    constructor(bool initvalue) {
        value = initvalue;
    }

    /// A message that can be called on instantiated contracts.
    /// This one flips the value of the stored `bool` from `true`
    /// to `false` and vice versa.
    function flip() public {
        value = !value;
    }

    /// Simply returns the current value of our `bool`.
    function get() public view returns (bool) {
        return value;
    }
}
