//global variables and functions
var result = 0;
var entries = [];
var lastNum = 0;
var currentNum = 0; //at any point this number is in memory if no number is pressed
var currentNumDisplay = "";
var currentOp = '';
var lastOp = '';
var oldResult = '';
//to prevent multiple decimals in same number
var sameNumberDecimal = false;
//new display variables
var $previousDisplay = $("#previousDisplay");
var $presentDisplay = $("#currentDisplay");
//check number of decimals in a number
Number.prototype.countDecimals = function () {
if(Math.floor(this.valueOf()) === this.valueOf()) return 0;
return this.toString().split(".")[1].length || 0;
}
function showMessage(character, message) {
if(character) {
$previousDisplay.html('<i style="font-size:0.6em; color:#BADCF3">'+oldResult+"</i>");
}
else if(!character) {
$previousDisplay.html("");
$previousDisplay.html('<i style="color:red;font-size:0.5em;">' + message +"</i>");
}
}
function resultCheck(num) {
var answer = 0;
//get length of number itself
var numberLength = num.toString().length;
console.log("Number Length = " + numberLength);
//CASE 1 - total 15 numbers on screen
if(numberLength <= 15) {
//if number of digits after decimal >= 13, fix to 10
if(num % 1 !== 0 && num.countDecimals >= 13) {
console.log("Num of decimals = " + num.countDecimals);
showMessage(false, "Result truncated");
answer = num.toFixed(10);
}
else {
answer = num;
}
}
//CASE 2 - more than 15 numbers on screen
else if(numberLength > 15) {
//check if decimals exists
if(num % 1 !== 0) {
var decimalDigits = num.countDecimals();
var preDecimalDigits = numberLength - decimalDigits;
if(preDecimalDigits <= 5 && decimalDigits >= 11) {
console.log("Inside else 1");
showMessage(false, "Result truncated");
answer = num.toFixed(10);
}
else if(preDecimalDigits >= 11 && decimalDigits >= 4) {
console.log("Inside else 2");
answer = num.toFixed(3);
}
else if(5 < preDecimalDigits <= 11 && decimalDigits < 4) {
console.log("Inside else 3");
answer = num;
}
}
else {
//no decimal places
console.log("Inside else 4");
showMessage(false, "Result too large");
answer = 0;
}
}
return answer;
}
function calculate(num1, op, num2) {
var result = 0;
if (op === "+") {
result = resultCheck(num1 + num2);
} else if (op === "-") {
result = resultCheck(num1 - num2);
}
else if (op === "*") {
result = resultCheck(num1 * num2);
}
else if (op === "/") {
if (num2 !== 0) {
result = resultCheck(num1 / num2);
}
else if(num2 === 0) {
console.log("Inside divide by zero loop");
showMessage(false, "Divide by Zero");
//$previousDisplay.html('<i style="font-size:0.7em;color:green;">'+oldResult+"</i>");
//$previousDisplay.html('<b style="font-size:0.5em;color:red;">'+"Invalid Operation"+"</b>");
result = 0;
}
}
else if (op === "sqrt") {
if (num1 >= 0) {
result = resultCheck(Math.sqrt(num1));
}
else {
showMessage(false, "Invalid Number");
result = 0;
}
}
else if (op === "%") {
if(num2 !== 0) {
result = num1 % num2;
}
else {
showMessage(false, "Invalid Number");
result = 0;
}
}
return result;
}
function pushOperator(oper) {
currentOp = oper;
entries.push(currentOp);
console.log("----");
console.log("Entries = " + entries);
//changes for new displays
showMessage(true, "");
//$previousDisplay.html('<i style="font-size:0.7em; color:#BADCF3">'+oldResult+"</i>");
console.log("Old Result = " + oldResult);
//clear currentOp
currentOp = '';
}
$(".table-cell").click(function () {
var $this = $(this);
//if button clicked was a number
if ($this.hasClass("number")) {
currentNum = parseInt($this.text(), 10);
//check if last entry in entries[] is also a number
lastNum = entries[entries.length - 1];
if ($.isNumeric(lastNum)) {
//number repition
//remove last number from entries
var lastNumS = lastNum.toString();
//if current number is of 14 or less digits
if(lastNumS.length <= 14) {
var last = entries.pop();
var lastS = last.toString();
//get last entry in entries, combine with this number, update currentNum, currentNumDisplay and display on screen
currentNumDisplay = lastS + currentNum;
currentNum = parseFloat(currentNumDisplay, 10);
//do same thing for old result display
entries.push(currentNum);
console.log("----");
console.log("Entries = " + entries);
oldResult = entries.join("");
//oldResult = currentNumDisplay;
showMessage(true, "");
//$previousDisplay.html('<i style="font-size:0.7em;color:green">'+oldResult+"</i><br>");
$presentDisplay.html(currentNumDisplay);
// oldResult = currentNumDisplay;
console.log("Old Result = " + oldResult);
}
}
//check if last entry in entries[] is "."
else if (entries[entries.length - 1] == ".") {
//last entry in entries is a dot
//remove '.'
entries.pop();
//remove last number in entries
lastNum = entries.pop();
//prepare formatted number
currentNumDisplay = lastNum + "." + currentNum;
//get formatted number to store in entries
currentNum = parseFloat(currentNumDisplay, 10);
entries.push(currentNum);
console.log("----");
console.log("Entries = " + entries);
//----------testing-----------
oldResult = entries.join("");
showMessage(true, "");
//---------------------------
//console.log("----");
//$display.html(currentNumDisplay);
$presentDisplay.html(currentNumDisplay);
}
else {
//if last entry in entries[] is not a number,
//it must be an operator or a new number
entries.push(currentNum);
console.log("----");
console.log("Entries = " + entries);
//----------testing-----------
oldResult = entries.join("");
//---------------------------
//previousDisplay.html('<i style="font-size:0.7em;color:green;">'+oldResult+"</i>");
showMessage(true, "");
$presentDisplay.html(currentNum);
//oldResult += currentNum;
console.log("Old Result = " + oldResult);
}
}
//else if button clicked was an operator
else if ($this.hasClass("op")) {
currentOp = $this.text();
oldResult += currentOp;
console.log("Current Op => " + currentOp);
/*----------------------------------------------------
check if the operator was a null operator AC|CE|=
-----------------------------------------------------*/
if ($this.hasClass("null-op")) {
//validation for decimal case
sameNumberDecimal = false;
//check if operator is an 'AC'
if (currentOp === "AC") {
//console.log("Inside if loop, Current Op = " + currentOp);
//clear entries array
entries = [];
console.log("----");
console.log("Entries = " + entries);
//console.log("----");
//clear screen display
//$display.html("");
$previousDisplay.html("");
$presentDisplay.html("");
//clear currentNum, currentOp, oldresult
currentNum = 0;
currentOp = '';
oldResult = '';
}
//check if operator was a 'CE'
else if (currentOp === "CE") {
//if last entry in entries is a number
if ($.isNumeric(entries[entries.length - 1])) {
//remove last number from entries
entries.pop();
//change - don't remove last operator from entries
//entries.pop();
console.log("----");
console.log("Entries = " + entries);
//console.log("----");
//reset currentOp,currentNum
currentNum = 0;
currentOp = '';
}
//if last entry in entries was not a number
else {
//last entry is an operator, but don't remove it
//entries.pop();
console.log("----");
console.log("Entries = " + entries);
//console.log("----");
//reset currentOp,currentNum
//currentNum = 0;
currentOp = '';
}
}
//check if operator was an '='
else if (currentOp === "=") {
//calculate result from entries
var temp = 0;
oldResult = entries.join("");
while (entries.length >= 3) {
temp = calculate(entries[0], entries[1], entries[2]);
entries.splice(0, 3, temp);
console.log("----");
console.log("Entries = " + entries);
console.log("----");
}
result = temp;
//$display.html(result);
// $previousDisplay.html("");
//showMessage(true,"");
$presentDisplay.html(result);
//reset entries & current op
currentOp = '';
entries = [];
console.log("Entries = " + entries);
}
}
/*----------------------------------------------------
check if operator was a unary operator SQRT|.
-----------------------------------------------------*/
else if ($this.hasClass("unary-op")) {
//check if operator was a sqrt
if ($this.hasClass("sqrt")) {
//validation for decimal case
sameNumberDecimal = false;
//check if last entry in entries was a number
if ($.isNumeric(entries[entries.length - 1])) {
//if yes, get last number in entries
lastNum = entries[entries.length - 1];
//compute result of square root
result = calculate(lastNum, "sqrt", 0);
//show result on screen
showMessage(true,"");
//$previousDisplay.html('<i style="font-size:0.7em;color:green">'+oldResult+"</i><br>");
$presentDisplay.html(result);
//reset everything
entries = [];
currentOp = '';
}
//if last entry was not a number
else {
//discard the value of sqrt
currentOp = '';
}
}
//check if operator was a dot
else if ($this.hasClass("dot")) {
//check if last entry in entries was a number - only valid case
if ($.isNumeric(entries[entries.length - 1])) {
console.log("Samenumberdecimal = " + sameNumberDecimal);
if(!sameNumberDecimal) {
sameNumberDecimal = true;
entries.push(".");
}
else {
}
}
//else - last entry in entries is not a number - ignore
}
}
/*---------------------------------------------------------
check if the operator was a binary operator - +|-|*|/|%
---------------------------------------------------------*/
else if ($this.hasClass("binary-op")) {
//validation for decimal case
sameNumberDecimal = false;
//check if last entry in entries is a number
if ($.isNumeric(entries[entries.length - 1])) {
//get what operator was pushed
if ($this.is("#add")) {
//if operator is +
pushOperator("+");
}
//if operator is '-'
else if ($this.is("#subtract")) {
//if operator is +
pushOperator("-");
}
//if operator is '*'
else if ($this.is("#multiply")) {
//if operator is +
pushOperator("*");
}
//if operator is '/'
else if ($this.is("#divide")) {
//if operator is +
pushOperator("/");
}
else if ($this.is("#percent")) {
//if operator is +
pushOperator("%");
}
}
//else last entry in entries is not a number
else {
//last entry is an operator, pop it
lastOp = entries.pop();
if ($this.is("#add")) {
//if operator is +
pushOperator("+");
}
//if operator is '-'
else if ($this.is("#subtract")) {
//if operator is -
//CHANGES for negative numbers
if(!entries.toString().length) {
//if entries is emtpy
entries.push(0);
pushOperator("-");
}
else {
pushOperator("-");
}
}
//if operator is '*'
else if ($this.is("#multiply")) {
//if operator is +
pushOperator("*");
}
//if operator is '/'
else if ($this.is("#divide")) {
//if operator is +
pushOperator("/");
}
else if ($this.is("#percent")) {
//if operator is +
pushOperator("%");
}
// if ($this.is("#add")) {
// //if operator is +
// currentOp = '+';
// entries.push(currentOp);
// console.log("----");
// console.log("Entries = " + entries);
// //changes for new displays
// //$previousDisplay.html('<i style="font-size:0.7em; color:green">'+oldResult+"</i>");
// console.log("Old Result = " + oldResult);
// //clear currentOp
// currentOp = '';
// }
}
}
}
});
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