excercise 1-2-3

by Pritesh Patel

HTML

<input type="button" value="click" id="btn"/>
<div id="demo"></div>
<div id="demo1"></div>
<div id="demo2"></div>

JavaScript

var btn= document.getElementById("btn");
var demo= document.getElementById("demo");
var demo1= document.getElementById("demo1");
var demo2= document.getElementById("demo2");

 btn.addEventListener('click',sum); 
btn.addEventListener('click', mul);
 btn.addEventListener('click',mod); 
/* btn.addEventListener('click',div); */




/* function sum(){

var a = 5;
var b = 10;
var c;

alert(c=a+b);

alert(c=a*b);
alert(c=b-a);
} */

function mul(){
var a=10; var b = 5;
var c=a*b;
  return demo.innerHTML=c;
}
function sum(){
var a=10; var b = 5;
var c=a+b;
  return demo1.innerHTML=c;
}
function mod(){
var a=10; var b = 3;
var c=a%b;
  return demo2.innerHTML=c;
}


/* function sub(){

var a = 5;var b = 10;var c;
alert(c=b-a);
}
function div(){

var a = 5;var b = 10;var c;
alert(c=b/a);
} */