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script.js
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script.js
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//operate function
let num1 = 0;
let num2 = 0;
let operator;
let zerroError = false;
let displayVal = "";
let operandCount = 0; //to know when pairs are created
let largeDisplay = document.querySelector(".large-display");
let smallDisplay = document.querySelector(".small-display");
let numberBtns = document.querySelectorAll(".number");
let operatorBtns = document.querySelectorAll(".operator");
let equals = document.querySelector(".equals");
let acBtn=document.querySelector(".ac");
function operate(num1, num2, operator) {
num1 = Number(num1);
num2 = Number(num2);
let result;
switch (operator) {
case "+":
result = add(num1, num2);
break;
case "-":
result = subtract(num1, num2);
break;
case "*":
result = multiply(num1, num2);
break;
case "/":
result = divide(num1, num2);
break;
default:
break;
}
return result;
}
const add = (num1, num2) => {
return num1 + num2;
};
const multiply = function (num1, num2) {
return num1 * num2;
};
const subtract = function (num1, num2) {
return num1 - num2;
};
const divide = function (num1, num2) {
if (num2 == 0) {
zerroError = true;
return "ERROR";
}
return num1 / num2;
};
//event listeners
numberBtns.forEach((number) => {
number.addEventListener("click", numberClick);
});
operatorBtns.forEach((operator) => {
operator.addEventListener("click", operatorClick);
});
equals.addEventListener("click", equalsHandler);
acBtn.addEventListener("click",clearFunc);
function numberClick() {
console.log("\nNumberclick()");
if (zerroError) {
console.log("zerroError");
return;
}
//displayVal used to concatenate all num entries and make a single number
displayVal = displayVal + this.value;
//dipslay current pressed
largeDisplay.innerText = displayVal;
if (operandCount == 0) {
//first time number is entered
num1 = displayVal;
} else if (operandCount == 1||operandCount==2) {
// number clicked after an operator is clicked. ie. num1 exists
num2 = displayVal;
operandCount = 2;
}
console.log("displayval:", displayVal, " num1,num2: ", num1, num2);
console.log("operator,operandcount: ", operator, operandCount);
}
function operatorClick() {
console.log("\nOperatorclick()");
if (operandCount == 0) {
//for when operator clicked after a number
//click after equals is buggy
operandCount = 1;
}
else if (operandCount == 2) {
//when two operands exists
let tempReturn = operate(num1, num2, operator);
//to check for divide by zero errors.
if (zerroError) {
console.log("zerro error");
//equalshandler to print error and show calculation on small display
equalsHandler();
return;
}
else {
//set num1 as result, num2 to zero and operandcount=1 to continue operations.
num1 = tempReturn;
num2 = 0;
operandCount = 1;
}
}
//set operator val and print calc on small display and currently pressed on largedisplay
operator = this.value;
largeDisplay.innerText = operator;
smallDisplay.innerText = num1 + " " + operator;
displayVal = ""; //reset displaVal for numberClick to work properly
console.log("displayval:", displayVal, " num1,num2: ", num1, num2);
console.log("operator,operandcount: ", operator, operandCount);
}
//onclick A/C button
function clearFunc() {
//resets all values, clears small display and print 0 in largedisplay
smallDisplay.innerText = "";
largeDisplay.innerText = 0;
zerroError = false;
num1 = 0;
num2 = 0;
displayVal = "";
operator = null;
operandCount = 0;
console.log(
"cleared: num1,num2,operator,operandcount:",
num1,
num2,
operator,
operandCount
);
}
//equals
function equalsHandler() {
console.log("EqualsHandler");
//only print equals when two operands are present.
if (operandCount == 2) {
let calc = operate(num1, num2, operator);
console.log("equals; ", calc);
smallDisplay.innerText = num1 + " " + operator + " " + num2 + " = ";
largeDisplay.innerText = calc;
//check zerroError to keep zerroError working normally
if(!zerroError){
//operandcount=0 so numberclick works normally after equals.
operandCount=0;
//displayVal=calc so it can be used for num1 concatination on numclick
displayVal = calc;
//num1=calc so operatorclick works normally after equals.
num1=calc;
}
}
}