'if' scenario in an equation. How do I implement it?

Basically I've been trying to make a working hours calculator and I've run into a problem. When the start time's value is greater than the finish time (eg. start is 23 and finish is 19), the result comes up as a negative. So what I want it to do in that scenario is to then multiply the negative number by -1 to make it positive again. However, this code below doesn't seem to have any effect in my app.

-(IBAction)done:(id)sender {
    int result = [finishHours.text intValue] - [startHours.text intValue];
    totalHours.text = [NSString stringWithFormat:@"%i", result];
    if (result开发者_JAVA百科 < 0) {
            result = result * -1;

    }

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You set totalHours.text before you change the sign of your result variable.

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what do you mean it doesn't have any effect? is it because you have changed result after you have set totalHours? would this fix your issue?

-(IBAction)done:(id)sender {
int result = [finishHours.text intValue] - [startHours.text intValue];
if (result < 0) {
        result = result * -1;

}
totalHours.text = [NSString stringWithFormat:@"%i", result];