// random number generator

var theDecimal = 0;
    function newProblem(){
        theDecimal = Math.floor(Math.random()*256); //math.floor chops off decimals and rounds
        document.getElementById("startNumber").innerHTML = theDecimal;

I need to convert the integer in order to display the ones complement and twos complement... please help I have very little experience with coding so I am most comfortable with functions. Thanks :)

I am afraid you're posting in the wrong forum; you want the JavaScript forum, under Web Development. Despite the names, Java and JavaScript are completely unrelated.