window.Calc = (function() {
    // Write a constructor function which takes a number, stores it, and
    // defines all Calc API functions
    var c = function(num) {
        // Find a way to store all instance viariables and functions
        // for this calculator

        // Implement getVal, plus, minus, times, divide, and clear
    };

    // Return your constructed object
    return c;
})();
