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script.js
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script.js
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"use strict";
/*
LIMITATIONS:
- works only on two numbers
CONSTRAINTS:
- cannot have two decimal points in a number
- cannot have two consecutive operators
- cannot have operator without two numbers
- can only have one decimal per number
- cannot have decimal only
- cannot have decimal and operator only
*/
// document.addEventListener(
// "DOMContentLoaded",
// function () {
// document.querySelector("#result").focus();
// },
// false
// );
let firstNum = "",
secondNum = "",
operator = "";
let firstNumNegative = false,
secondNumNegative = false,
reset = false;
function scroll() {
const result = document.getElementById("result");
result.scrollTo({
left: result.scrollWidth,
behavior: "smooth",
});
}
function toggleNegative() {
if (reset) {
clr();
}
let oldText = document.querySelector("#result").value;
if (operator === "") {
if (firstNumNegative == true) {
let newText = oldText.replace("-", "");
document.querySelector("#result").value = newText;
firstNumNegative = false;
} else {
document.querySelector("#result").value = `-${oldText}`;
firstNumNegative = true;
}
} else {
let operatorPos = oldText.indexOf(operator);
if (secondNumNegative == true) {
// remove the negative symbol for the second number
let secondNumText = oldText.substring(operatorPos, -1);
console.log(`second num text = ${secondNumText}`);
let finalText = secondNumText.replace("-", "");
console.log(`final text = ${finalText}`);
document.querySelector("#result").value = `${oldText.substring(
0,
operatorPos + 1
)}${finalText}`;
secondNumNegative = false;
} else {
// check if a number is already given
if (
oldText.charAt(oldText.length - 1) == operator ||
oldText.charAt(oldText.length - 1) == "-"
) {
// if no number, just append a "-" symbol
console.log(`no number, appending negative symbol`);
document.querySelector("#result").value = `${oldText}-`;
} else {
// if number exists, insert a negative symbol
console.log(`number exists. Inserting negative symbol`);
let newText = `${oldText.substring(
0,
operatorPos + 1
)}-${oldText.substring(operatorPos, -1)}`;
document.querySelector("#result").value = newText;
}
secondNumNegative = true;
}
}
}
function addDecimal() {
if (reset) {
clr();
}
let oldText = document.querySelector("#result").value;
// check which number is on
if (secondNum === "") {
// check if already has decimal
if (!firstNum.includes(".")) {
firstNum += ".";
document.querySelector("#result").value = `${oldText}.`;
// console.log("added decimal");
} else {
console.error("firstNum already has a decimal");
}
} else {
// check if already has decimal
if (!secondNum.includes(".")) {
secondNum += ".";
document.querySelector("#result").value = `${oldText}.`;
// console.log("added decimal");
} else {
console.error("secondNum already has a decimal");
}
}
}
function addNum(num) {
if (reset) {
clr();
}
let oldText = document.querySelector("#result").value;
if (operator === "") {
firstNum += num;
document.querySelector("#result").value = `${oldText}${num}`;
scroll();
// console.log(`firstNum = ${firstNum}`);
} else {
secondNum += num;
document.querySelector("#result").value = `${oldText}${num}`;
scroll();
// console.log(`secondNum = ${secondNum}`);
}
}
function addOperator(newOperator) {
if (reset) {
clr();
}
// check if number already present
if (firstNum === "") {
console.error("Select a number first");
return;
}
// check if operator already present
else if (operator === "") {
// check if firstNum contains at least 1 number
if (!isNaN(parseFloat(firstNum))) {
let oldText = document.querySelector("#result").value;
operator = newOperator;
document.querySelector("#result").value = `${oldText}${operator}`;
// console.log(`operator = ${operator}`);
scroll();
} else {
console.error("Must have number before adding operator");
return;
}
} else {
console.error("Operator already selected");
return;
}
}
function del() {
if (reset) {
clr();
}
if (secondNum != "") {
sliceLast();
secondNum = secondNum.slice(0, -1);
// console.log(`secondNum(sliced) = ${secondNum}`);
scroll();
} else if (operator != "") {
sliceLast();
operator = "";
// console.log(`operator removed!`);
scroll();
} else {
sliceLast();
firstNum = firstNum.slice(0, -1);
// console.log(`firstNum(sliced) = ${firstNum}`);
scroll();
}
}
function sliceLast() {
let newText = document.querySelector("#result").value.slice(0, -1);
document.querySelector("#result").value = newText;
}
function calculate() {
if (reset) {
clr();
}
if (secondNum == "" && operator != "²") {
console.error("No second number and not exponential");
return;
}
if (firstNumNegative == true) {
firstNum = -Math.abs(firstNum);
}
if (secondNumNegative == true) {
secondNum = -Math.abs(secondNum);
}
switch (operator) {
case "+":
document.querySelector("#result").value = `${
parseFloat(firstNum) + parseFloat(secondNum)
}`;
reset = true;
break;
case "-":
document.querySelector("#result").value = `${
parseFloat(firstNum) - parseFloat(secondNum)
}`;
reset = true;
break;
case "×":
document.querySelector("#result").value = `${
parseFloat(firstNum) * parseFloat(secondNum)
}`;
reset = true;
break;
case "÷":
document.querySelector("#result").value = `${
parseFloat(firstNum) / parseFloat(secondNum)
}`;
reset = true;
break;
case "²":
document.querySelector("#result").value = `${parseFloat(firstNum) ** 2}`;
reset = true;
break;
case "%":
document.querySelector("#result").value = `${firstNum % secondNum}`;
reset = true;
break;
}
}
function clr() {
document.querySelector("#result").value = "";
(firstNum = ""), (secondNum = ""), (operator = "");
(firstNumNegative = false), (secondNumNegative = false), (reset = false);
}