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JAVASCRIPT

Javascript Calculator

let screen = document.getElementById('screen');
buttons = document.querySelectorAll('button');
let screenValue = '';
for (item of buttons) {
    item.addEventListener('click', (e) => {
        buttonText = e.target.innerText;
        console.log('Button text is ', buttonText);
        if (buttonText == 'X') {
            buttonText = '*';
            screenValue += buttonText;
            screen.value = screenValue;
        }
        else if (buttonText == 'C') {
            screenValue = "";
            screen.value = screenValue;
        }
        else if (buttonText == '=') {
            screen.value = eval(screenValue);
        }
        else {
            screenValue += buttonText;
            screen.value = screenValue;
        }

    })
}
Comment

Calculator Function JS Javascript

function calculate(number1,number2,operator){
if (!number1 || !number2){
    return "Invalid number"
}
if (!['*','-','/','+'].includes(operator)){
    return "Invalid operator"
}
switch(operator){
  case "+":
    return number1 + number2;
  case "/":
    return number1 * number2;
  case "*":
    return number1 * number2;
  case "-":
    return number1 - number2;
 }
}
console.log(calculate(5,6,"+"))
Comment

simple calculator using javascript

<style>  
h1 {  
    text-align: center;  
    padding: 23px;  
    background-color: rgb(238, 236, 119);  
    color: rgb(14, 12, 12);  
    }  
  
#clear{  
width: 280px;  
border: 3px solid rgb(5, 5, 5);  
    border-radius: 5px;  
    padding: 20px;  
    background-color: rgb(240, 85, 85) 
}  
  
.formstyle  
{  
width: 300px;  
height: 460px;  
margin: auto;  
border: 5px solid rgb(6, 7, 7);  
border-radius: 5px;  
padding: 20px;  
}  
  
  
  
input  
{  
width: 20px; 
height:20px; 
background-color: rgb(198, 241, 198);  
color: rgb(61, 60, 60);  
border: 3px solid rgb(15, 14, 14);  
    border-radius: 5px;  
    padding: 26px;  
    margin: 5px;  
    margin-bottom: 2px;
    font-size: 22px; 
    font-weight: 600; 
}  
  
  
#calc{  
width: 250px;  
background-color: beige;
font-size: x-large;
font-weight:700;
border: 5px solid black;  
    border-radius: 3px;  
    padding: 20px;  
    margin: auto;  
}  
</style>  
  
</head>  
<body>  
<h1>Simple Calculator </h1>  
<div class= "formstyle">  
<form name = "form1">  
      
    <!-- This input box shows the button pressed by the user in calculator. -->  
  <input id = "calc" type ="text" name = "answer"> <br> <br>  
  <!-- Display the calculator button on the screen. -->  
  <!-- onclick() function display the number prsses by the user. -->  
  <input type = "button" value = "1" onclick = "form1.answer.value += '1' ">  
  <input type = "button" value = "2" onclick = "form1.answer.value += '2' ">  
  <input type = "button" value = "3" onclick = "form1.answer.value += '3' ">  
   <input type = "button" value = "+" onclick = "form1.answer.value += '+' ">  
  <br> <br>  
    
  <input type = "button" value = "4" onclick = "form1.answer.value += '4' ">  
  <input type = "button" value = "5" onclick = "form1.answer.value += '5' ">  
  <input type = "button" value = "6" onclick = "form1.answer.value += '6' ">  
  <input type = "button" value = "-" onclick = "form1.answer.value += '-' ">  
  <br> <br>  
    
  <input type = "button" value = "7" onclick = "form1.answer.value += '7' ">  
  <input type = "button" value = "8" onclick = "form1.answer.value += '8' ">  
  <input type = "button" value = "9" onclick = "form1.answer.value += '9' ">  
  <input type = "button" value = "*" onclick = "form1.answer.value += '*' ">  
  <br> <br>  
    
    
  <input type = "button" value = "/" onclick = "form1.answer.value += '/' ">  
  <input type = "button" value = "0" onclick = "form1.answer.value += '0' ">  
    <input type = "button" value = "." onclick = "form1.answer.value += '.' ">  
    <!-- When we click on the '=' button, the onclick() shows the sum results on the calculator screen. -->  
  <input type = "button" value = "=" onclick = "form1.answer.value = eval(form1.answer.value) ">  
  <br>   
  <!-- Display the Cancel button and erase all data entered by the user. -->  
  <input type = "button" value = "Clear" onclick = "form1.answer.value = ' ' " id= "clear" >  
  <br>   
    
</form>  
</div>
Comment

JavaScript Calculator

<!-- Create a simple Program to build the Calculator in JavaScript using with HTML and CSS web languages. -->  
<!DOCTYPE html>  
<html lang = "en">  
<head>  
<title> JavaScript Calculator </title>  
  
<style>  
h1 {  
    text-align: center;  
    padding: 23px;  
    background-color: skyblue;  
    color: white;  
    }  
  
#clear{  
width: 270px;  
border: 3px solid gray;  
    border-radius: 3px;  
    padding: 20px;  
    background-color: red;  
}  
  
.formstyle  
{  
width: 300px;  
height: 530px;  
margin: auto;  
border: 3px solid skyblue;  
border-radius: 5px;  
padding: 20px;  
}  
  
  
  
input  
{  
width: 20px;  
background-color: green;  
color: white;  
border: 3px solid gray;  
    border-radius: 5px;  
    padding: 26px;  
    margin: 5px;  
    font-size: 15px;  
}  
  
  
#calc{  
width: 250px;  
border: 5px solid black;  
    border-radius: 3px;  
    padding: 20px;  
    margin: auto;  
}  
  
</style>  
  
</head>  
<body>  
<h1> Calculator Program in JavaScript </h1>  
<div class= "formstyle">  
<form name = "form1">  
      
    <!-- This input box shows the button pressed by the user in calculator. -->  
  <input id = "calc" type ="text" name = "answer"> <br> <br>  
  <!-- Display the calculator button on the screen. -->  
  <!-- onclick() function display the number prsses by the user. -->  
  <input type = "button" value = "1" onclick = "form1.answer.value += '1' ">  
  <input type = "button" value = "2" onclick = "form1.answer.value += '2' ">  
  <input type = "button" value = "3" onclick = "form1.answer.value += '3' ">  
   <input type = "button" value = "+" onclick = "form1.answer.value += '+' ">  
  <br> <br>  
    
  <input type = "button" value = "4" onclick = "form1.answer.value += '4' ">  
  <input type = "button" value = "5" onclick = "form1.answer.value += '5' ">  
  <input type = "button" value = "6" onclick = "form1.answer.value += '6' ">  
  <input type = "button" value = "-" onclick = "form1.answer.value += '-' ">  
  <br> <br>  
    
  <input type = "button" value = "7" onclick = "form1.answer.value += '7' ">  
  <input type = "button" value = "8" onclick = "form1.answer.value += '8' ">  
  <input type = "button" value = "9" onclick = "form1.answer.value += '9' ">  
  <input type = "button" value = "*" onclick = "form1.answer.value += '*' ">  
  <br> <br>  
    
    
  <input type = "button" value = "/" onclick = "form1.answer.value += '/' ">  
  <input type = "button" value = "0" onclick = "form1.answer.value += '0' ">  
    <input type = "button" value = "." onclick = "form1.answer.value += '.' ">  
    <!-- When we click on the '=' button, the onclick() shows the sum results on the calculator screen. -->  
  <input type = "button" value = "=" onclick = "form1.answer.value = eval(form1.answer.value) ">  
  <br>   
  <!-- Display the Cancel button and erase all data entered by the user. -->  
  <input type = "button" value = "Clear All" onclick = "form1.answer.value = ' ' " id= "clear" >  
  <br>   
    
</form>  
</div>  
</body>  
</html>  
Comment

JavaScript Calculator

<!-- Create a simple Program to build the Calculator in JavaScript using with HTML and CSS web languages. -->  
<!DOCTYPE html>  
<html lang = "en">  
<head>  
<title> JavaScript Calculator </title>  
  
<style>  
h1 {  
    text-align: center;  
    padding: 23px;  
    background-color: skyblue;  
    color: white;  
    }  
  
#clear{  
width: 270px;  
border: 3px solid gray;  
    border-radius: 3px;  
    padding: 20px;  
    background-color: red;  
}  
  
.formstyle  
{  
width: 300px;  
height: 530px;  
margin: auto;  
border: 3px solid skyblue;  
border-radius: 5px;  
padding: 20px;  
}  
  
  
  
input  
{  
width: 20px;  
background-color: green;  
color: white;  
border: 3px solid gray;  
    border-radius: 5px;  
    padding: 26px;  
    margin: 5px;  
    font-size: 15px;  
}  
  
  
#calc{  
width: 250px;  
border: 5px solid black;  
    border-radius: 3px;  
    padding: 20px;  
    margin: auto;  
}  
  
</style>  
  
</head>  
<body>  
<h1> Calculator Program in JavaScript </h1>  
<div class= "formstyle">  
<form name = "form1">  
      
    <!-- This input box shows the button pressed by the user in calculator. -->  
  <input id = "calc" type ="text" name = "answer"> <br> <br>  
  <!-- Display the calculator button on the screen. -->  
  <!-- onclick() function display the number prsses by the user. -->  
  <input type = "button" value = "1" onclick = "form1.answer.value += '1' ">  
  <input type = "button" value = "2" onclick = "form1.answer.value += '2' ">  
  <input type = "button" value = "3" onclick = "form1.answer.value += '3' ">  
   <input type = "button" value = "+" onclick = "form1.answer.value += '+' ">  
  <br> <br>  
    
  <input type = "button" value = "4" onclick = "form1.answer.value += '4' ">  
  <input type = "button" value = "5" onclick = "form1.answer.value += '5' ">  
  <input type = "button" value = "6" onclick = "form1.answer.value += '6' ">  
  <input type = "button" value = "-" onclick = "form1.answer.value += '-' ">  
  <br> <br>  
    
  <input type = "button" value = "7" onclick = "form1.answer.value += '7' ">  
  <input type = "button" value = "8" onclick = "form1.answer.value += '8' ">  
  <input type = "button" value = "9" onclick = "form1.answer.value += '9' ">  
  <input type = "button" value = "*" onclick = "form1.answer.value += '*' ">  
  <br> <br>  
    
    
  <input type = "button" value = "/" onclick = "form1.answer.value += '/' ">  
  <input type = "button" value = "0" onclick = "form1.answer.value += '0' ">  
    <input type = "button" value = "." onclick = "form1.answer.value += '.' ">  
    <!-- When we click on the '=' button, the onclick() shows the sum results on the calculator screen. -->  
  <input type = "button" value = "=" onclick = "form1.answer.value = eval(form1.answer.value) ">  
  <br>   
  <!-- Display the Cancel button and erase all data entered by the user. -->  
  <input type = "button" value = "Clear All" onclick = "form1.answer.value = ' ' " id= "clear" >  
  <br>   
    
</form>  
</div>  
</body>  
</html>  
Comment

Calculator website javascript code

function getHistory(){
	return document.getElementById("history-value").innerText;
}
function printHistory(num){
	document.getElementById("history-value").innerText=num;
}
function getOutput(){
	return document.getElementById("output-value").innerText;
}
function printOutput(num){
	if(num==""){
		document.getElementById("output-value").innerText=num;
	}
	else{
		document.getElementById("output-value").innerText=getFormattedNumber(num);
	}	
}
function getFormattedNumber(num){
	if(num=="-"){
		return "";
	}
	var n = Number(num);
	var value = n.toLocaleString("en");
	return value;
}
function reverseNumberFormat(num){
	return Number(num.replace(/,/g,''));
}
var operator = document.getElementsByClassName("operator");
for(var i =0;i<operator.length;i++){
	operator[i].addEventListener('click',function(){
		if(this.id=="clear"){
			printHistory("");
			printOutput("");
		}
		else if(this.id=="backspace"){
			var output=reverseNumberFormat(getOutput()).toString();
			if(output){
				output= output.substr(0,output.length-1);
				printOutput(output);
			}
		}
		else{
			var output=getOutput();
			var history=getHistory();
			if(output==""&&history!=""){
				if(isNaN(history[history.length-1])){
					history= history.substr(0,history.length-1);
				}
			}
			if(output!="" || history!=""){
				output= output==""?output:reverseNumberFormat(output);
				history=history+output;
				if(this.id=="="){
					var result=eval(history);
					printOutput(result);
					printHistory("");
				}
				else{
					history=history+this.id;
					printHistory(history);
					printOutput("");
				}
			}
		}
		
	});
}
var number = document.getElementsByClassName("number");
for(var i =0;i<number.length;i++){
	number[i].addEventListener('click',function(){
		var output=reverseNumberFormat(getOutput());
		if(output!=NaN){ 
			output=output+this.id;
			printOutput(output);
		}
	});
}
Comment

javascript-calculator

const number2 = parseFloat(prompt ('Enter the second number: ')); let result; // declaration of the variable. // use if, elseif and else keyword to define the calculator condition in JavaScript. if (operator == '+') { // use + (addition) operator to add two numbers.
Comment
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