var accumulator = 0.0;
var lstEntr = 0.0;
var deciPnt = 0;
var sign = 1;
var lstKey = "equals";
var clcTsk = "equals";

function Adddigit(digit) {
    var temp;
    if (lstKey != "digit") {
        document.bscClcJs.bscClcRslt.value = 0.0;
        if (lstKey == "equals") {
            accumulator = 0.0;
            clcTsk = "equals";
        }
    }
    temp = parseFloat(document.bscClcJs.bscClcRslt.value);
    if (deciPnt == 0)
        document.bscClcJs.bscClcRslt.value = temp * 10 + parseInt(digit) * sign;
    else {
        document.bscClcJs.bscClcRslt.value = temp + parseInt(digit) / deciPnt * sign;
        deciPnt = deciPnt * 10;
    }
    lstEntr = parseFloat(document.bscClcJs.bscClcRslt.value);
    lstKey = "digit";
}

function clcInput(frmClcltr) {
    switch (clcTsk) {
        case "equals":
            {
                accumulator = parseFloat(document.bscClcJs.bscClcRslt.value);
                break;
            }
        case "add":
            {
                accumulator = accumulator + lstEntr;
                document.bscClcJs.bscClcRslt.value = accumulator;
                break;
            }
        case "subtract":
            {
                accumulator = accumulator - lstEntr;
                document.bscClcJs.bscClcRslt.value = accumulator;
                break;
            }
        case "multiply":
            {
                accumulator = accumulator * lstEntr;
                document.bscClcJs.bscClcRslt.value = accumulator;
                break;
            }
        case "divide":
            {
                accumulator = accumulator / lstEntr;
                document.bscClcJs.bscClcRslt.value = accumulator;
                break;
            }
    }
    if (lstKey != "equals") clcTsk = lstKey;
}

function Add(frmClcltr) {
    deciPnt = 0;
    sign = 1;
    lstEntr = parseFloat(document.bscClcJs.bscClcRslt.value);
    if (lstKey == "digit") {
        lstKey = "add";
        clcInput(frmClcltr);
    } else {
        lstKey = "add";
        clcTsk = "add";
    }
}

function Subtract(frmClcltr) {
    deciPnt = 0;
    sign = 1;
    lstEntr = parseFloat(document.bscClcJs.bscClcRslt.value);
    if (lstKey == "digit") {
        lstKey = "subtract";
        clcInput(frmClcltr);
    } else {
        lstKey = "subtract";
        clcTsk = "subtract";
    }
}

function Multiply(frmClcltr) {
    deciPnt = 0;
    sign = 1;
    lstEntr = parseFloat(document.bscClcJs.bscClcRslt.value);
    if (lstKey == "digit") {
        lstKey = "multiply";
        clcInput(frmClcltr);
    } else {
        lstKey = "multiply";
        clcTsk = "multiply";
    }
}

function Divide(frmClcltr) {
    deciPnt = 0;
    sign = 1;
    lstEntr = parseFloat(document.bscClcJs.bscClcRslt.value);
    if (lstKey == "digit") {
        lstKey = "divide";
        clcInput(frmClcltr);
    } else {
        lstKey = "divide";
        clcTsk = "divide";
    }
}

function Equals(frmClcltr) {
    deciPnt = 0;
    sign = 1;
    if ((lstKey == "add") || (lstKey == "subtract") ||
        (lstKey == "multiply") || (lstKey == "divide"))
        clcTsk = lstKey;
    lstKey = "equals";
    clcInput(frmClcltr);
}

function SetDeciPnt() {
    deciPnt = 10;
}

function Squareroot(frmClcltr) {
    deciPnt = 0;
    sign = 1;
    lstKey = "equals";
    temp = parseFloat(document.bscClcJs.bscClcRslt.value);
    document.bscClcJs.bscClcRslt.value = Math.sqrt(temp);
    lstEntr = parseFloat(document.bscClcJs.bscClcRslt.value);
}

function Percent(frmClcltr) {
    deciPnt = 0;
    sign = 1;
    lstKey = "equals";
    document.bscClcJs.bscClcRslt.value = (lstEntr / 100) * accumulator;
    lstEntr = parseFloat(document.bscClcJs.bscClcRslt.value);
}

function ChngeSign(frmClcltr) {
    sign = sign * -1;
    temp = parseFloat(document.bscClcJs.bscClcRslt.value);
    document.bscClcJs.bscClcRslt.value = temp * -1;
    lstEntr = parseFloat(document.bscClcJs.bscClcRslt.value);
}

function Invert(frmClcltr) {
    deciPnt = 0;
    sign = 1;
    lstKey = "equals";
    temp = parseFloat(document.bscClcJs.bscClcRslt.value);
    document.bscClcJs.bscClcRslt.value = 1 / temp;
    lstEntr = parseFloat(document.bscClcJs.bscClcRslt.value);
}

function Initialize(frmClcltr) {
    accumulator = 0.0;
    lstEntr = 0.0;
    deciPnt = 0;
    sign = 1;
    lstKey = "equals";
    clcTsk = "equals";
    document.bscClcJs.bscClcRslt.value = 0.0;
    document.bscClcJs.bscClcRslt.focus();
}

function ClearEntry(frmClcltr) {
    lstEntr = 0.0;
    deciPnt = 0;
    sign = 1;
    document.bscClcJs.bscClcRslt.value = 0.0;
    document.bscClcJs.bscClcRslt.focus();
}