Fix the HTML so there is no more embedded Javascript HTML CODE: Calculator My Calculator This web page requires JavaScript to be enabled on your

Fix the HTML so there is no more embedded Javascript

HTML CODE:

My Calculator

Please enter a numeric value or use the number buttons below.

Validate HTML

Validate CSS

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JAVA SCRIPT

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/Global variables

var prevCalc = 0;

var calc = "";

//The following function displays a number in the textfield when a number is clicked.

//Note that it keeps concatenating numbers which are clicked.

function showNum(value) {

document.frmCalc.txtNumber.value += value;

}

//The following function decreases the value of displayed number by 1.

//isNaN method checks whether the value passed to the method is a number or not.

function decrement() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

num--;

document.frmCalc.txtNumber.value = num;

}

}

//The following function increases the value of displayed number by 1.

//isNaN method checks whether the value passed to the method is a number or not.

function increment() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

num++;

document.frmCalc.txtNumber.value = num;

}

}

//The following function is called when "sqrt" button is clicked.

//Note that it also changes the values of the global variables.

function sqrt() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

var sqrtvalue = Math.sqrt(num);

document.frmCalc.txtNumber.value = sqrtvalue;

}

}

//The following function is called when "floor" button is clicked.

//Note that it also changes the values of the global variables.

function floor() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

var floorvalue = Math.floor(num);

document.frmCalc.txtNumber.value = floorvalue;

}

}

//The following function is called when "round" button is clicked.

//Note that it also changes the values of the global variables.

function round() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

var roundvalue = Math.round(num);

document.frmCalc.txtNumber.value = roundvalue;

}

}

//The following function is called when "square" button is clicked.

//Note that it also changes the values of the global variables.

function square() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

var powvalue = Math.pow(num, 2);

document.frmCalc.txtNumber.value = powvalue;

}

}

//The following function is called when "Add" button is clicked.

//Note that it also changes the values of the global variables.

function add() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

prevCalc = num;

document.frmCalc.txtNumber.value = "";

calc = "Add";

}

}

//The following function is called when "Subtract" button is clicked.

//Note that it also changes the values of the global variables.

function subtract() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

prevCalc = num;

document.frmCalc.txtNumber.value = "";

calc = "Subtract";

}

}

//The following function is called when "Multiply" button is clicked.

//Note that it also changes the values of the global variables.

function multiply() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

prevCalc = num;

document.frmCalc.txtNumber.value = "";

calc = "Multiply";

}

}

//The following function is called when "Divide" button is clicked.

//Note that it also changes the values of the global variables.

function divide() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

prevCalc = num;

document.frmCalc.txtNumber.value = "";

calc = "Divide";

}

}

//The following function is called when "Power" button is clicked.

//Note that it also changes the values of the global variables.

function power() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

prevCalc = num;

document.frmCalc.txtNumber.value = "";

calc = "Power";

}

}

//The following function is called when "Calculate" button is clicked.

//Note that this function is dependent on the value of global variable.

function calculate() {

var num = parseFloat(document.frmCalc.txtNumber.value);

if (!(isNaN(num))) {

var total = 0;

if (calc == "Add"){

total = prevCalc + num;

document.frmCalc.txtNumber.value = total;

} else if (calc == "Subtract") {

total = prevCalc - num;

document.frmCalc.txtNumber.value = total;

} else if (calc == "Multiply") {

total = prevCalc * num;

document.frmCalc.txtNumber.value = total;

} else if (calc == "Divide") {

total = prevCalc / num;

document.frmCalc.txtNumber.value = total;

} else if (calc == "Power") {

total = Math.pow(prevCalc, num);

document.frmCalc.txtNumber.value = total;

}

}

}

function clear() {

document.frmCalc.txtNumber.value = "";

prevCalc = 0;

calc = "";

}