How do I convert a number to hours and minutes? - iphone

Question

I got help with correct calculation the other day but I've hit a block about how to implement it into code.
-(IBAction)done:(id)sender {
int result = (([startHours.text intValue] * 60) + [startMinutes.text intValue]) -
(([finishHours.text intValue] * 60) + [finishMinutes.text intValue]);
totalHours.text = [NSString stringWithFormat:#"%i", result / 60];
if (result < 0) {
totalHours.text = [NSString stringWithFormat:#"%d", result * -1];
}
The above is the code. However, in the text field it comes out as the total number of minutes. I want to covert it so it would show up as total hours and minutes (10.30). How would I do that in code?

Answer 1

If result is a time in minutes:
int minutes = result%60
int hours = (result - minutes)/60
totalHours.text = [NSString stringWithFormat:#"%d.%d", hours, minutes];

Answer 2

Pheelicks's answer is OK. Just two small additions: handle sign of interval before calculating parts, and use more common time format:
int result = (([startHours.text intValue] * 60) + [startMinutes.text intValue]) -
(([finishHours.text intValue] * 60) + [finishMinutes.text intValue]);
int minutes = abs(result)%60
int hours = (abs(result) - minutes)/60
totalHours.text = [NSString stringWithFormat:#"%02d:%02d", hours, minutes];

Answer 3

Try changing the int to a float.
-(IBAction)done:(id)sender {
float result = (([startHours.text intValue] * 60) + [startMinutes.text intValue]) -
(([finishHours.text intValue] * 60) + [finishMinutes.text intValue]);
totalHours.text = [NSString stringWithFormat:#"%2.2f", result / 60];
if (result < 0) {
totalHours.text = [NSString stringWithFormat:#"%2.2f", result * -1];
}