JavaScript

 JavaScript

prompt("What is your name");

'Hera' // after inter a name

var first = prompt("ENTER FIRST NUMBER");      // shift + Enter     …new line

var Second = prompt("ENTER SECOND NUMBER");

undefined

first

'1411'

Second

'68'

var sum = Number(first) + Number(Second)  // addition string to number

undefined

sum

1479

Create a Calculator for adding numbers in JavaScript?

var first = prompt("ENTER FIRST NUMBER");     

var Second = prompt("ENTER SECOND NUMBER");

var sum = Number(first) + Number(Second);

alert(sum);