Is it ok to get undefined?

Is it ok to get undefined if a function doesn't get called right away?
Like in the console I get the following...

function add(num1, num2) {
var total = num1 + num2;
return total;
}
undefined

But if I call the function straight away and add arguments I get without undefined displayed in the console.

function add(num1, num2) {
var total = num1 + num2;
return total;
}
add(2, 5);
7

Please note I'm using var instead of const as the console keeps variables in memory for a long time.
Thanks