The following two programs differ in that one uses parseFloat and the other does not. What will be the output from each program if the user inputs 4 followed by 2?

Give your reasons.

Program 1

var first;
var second;
first = window.prompt('Enter a digit','0');
second = window.prompt('Enter a second
digit','0');
document.write(first + second);

Program 2

var first;
var second;
first = window.prompt('Enter a digit','0');
second = window.prompt('Enter a second
digit','0');

first = parseFloat(first);

second = parseFloat(second);

document.write(first + second);