function reverseString(string) {
    var i = string.length;
    var output = [];

    while (i--) {
        output.push(string.substring(i, i + 1));
    }

    return output.join("");
}

function stringToASCII(string) {
    var chars;
    var i;
    var output = [];

    switch (typeof string) {
    case "string":
        chars = string.split("");
        i = chars.length;
        
        while (i--) {
            output.push(chars[i].charCodeAt());
        }

        output.reverse();
        break;
    default:
        return -1;
    }

    return output.join(", ");
}

function menuStub() {
    var input = parseInt(prompt("Enter a digit from 1 to 4:"), 10);
    var message = "You've called Menu Option: ";
    
    switch (input) {
    case 1:
        alert(message + input);
        break;
    case 2:
        alert(message + input);
        break;
    case 3:
        alert(message + input);
        break;
    case 4:
        alert(message + input);
        break;
    default:
        alert("You have not entered a digit from 1 to 4.");
    }
}

function emailProgram() {
    var email = {
        address: "",
        subject: "",
        messageBody: "",
    
        Send: function () {
            var output;

            output = "Address: " + this.address + "\r\n" +
                     "Subject: " + this.subject + "\r\n" +
                     "Message: " + this.messageBody + "\r\n";

            alert(output);
            alert("Your message has been sent.");
        }
    };

    do {
        email.address = prompt("Enter E-mail Address of recepient: ",
                email.address);
        email.subject = prompt("Enter E-Mail subject:", email.subject);
        email.messageBody = prompt("Enter Message:", email.messageBody);
    } while (email.address === "" || email.subject === "" ||
             email.messageBody === "");

    email.Send();
}