Making the Clear button clear all values

…With the number buttons working, let's make…the clear button do what it's supposed to.…Find the tapped clear function, mine is on line 30,…and then we're going to reset all of our values here.…That means we're going to set total equal to 0, we're…going to set value string equal to an empty string,…And then we'll make the text label show 0.…Now here, we can use 0 as a string because we don't…care what the other values are because we're resetting them right here.…

So we don't need to go through the…extra effort of using NS string, string with format.…So let's test the application,…so I'll type some numbers.…Click the C button.…And the calculator clears.…Everything works as expected.…So again, to clear the calculator we simply reset all…these values back to where they were when we started.…