function exercise4()
{
    var pascalHeight = parseInt(document.getElementsByName('pascalHeight')[0].value);
    var actualWidth = 0;
    var destinationWidth = 0;

    var resultDiv = document.getElementById("exercise4Results");
    resultDiv.textContent = "";
    resultDiv.setAttribute('style', 'white-space: pre;')

    var result = exercise4_recursion(1, 3);
    for(var h = 1; h <= pascalHeight; h++)
    {
        for(var actualWidth = 0; actualWidth < h; actualWidth++)
        {
            resultDiv.textContent += exercise4_recursion(actualWidth, h) + " ";
        }
        resultDiv.textContent += "\r\n";
    }

}

function exercise4_recursion(actualWidth, destinationWidth)
{
    /*
    console.log("# DEBUG #");
    console.log(actualWidth);
    console.log(destinationWidth);
    console.log("# DEBUG #");
    */

    if(actualWidth == 0 || (actualWidth + 1) == destinationWidth)
        return 1;
    else
        return exercise4_recursion(actualWidth - 1, destinationWidth - 1) + exercise4_recursion(actualWidth, destinationWidth - 1);
}