CODEWITHSUNDEEP
objective-ccocoatime
Rob
Rob

Reputation: 51

Convert float representing hours to integer hours and minutes

I'm using the standard equation of distance / speed = arrival time. This works fine, but the answer is a float number and most people would find it awkward to convert something like 1.75 hrs to be 1 hr and 45 minutes.

I want to take that final float number result and extract the hour(s) separately from the minutes as integers.

Here is what I've tried:

-(IBAction)calculate:(id)sender {

float spd=[speed.text floatValue];

float dist=[distKnots.text floatValue];

//this give me the answer as a float

float arr=(dist/bs);

//this is how I showed it as an answer

//Here I need to convert "arr" and extract the hours & minutes as whole integers

arrivalTime.text=[NSString stringWithFormat:@"%0.02f", arr];

[speed resignFirstResponder];
}

And this is the conversion I tried to do -- and on paper it works, but in code it's full of errors:

int justHours = arr*60;

int justMinutes = (arr*60)-(justHours*60);

//then for the user friendly answer:

arrivalTime.text=[NSString stringWithFormat:@"%n hours and %n minutes", justHours, justMinutes];

I'm new to Objective-C and hoping there is a way to get this to work or a better way altogether to resolve this.

Upvotes: 3

Views: 4183

Answers (3)

Alnitak
Alnitak

Reputation: 339816

Your arr variable is already measured in hours, so you shouldn't be scaling it, just rounding it down:

int justHours = (int)arr;

and then your minutes is sixty times the (integer) difference between the original and rounded hours (i.e. the fractional part).

int justMinutes = (int)((arr - justHours) * 60);

Upvotes: 3

Marcal
Marcal

Reputation: 1371

check the NSNumber numberFormater class. I believe you can wrap your float with time format and the return it to the user.

Upvotes: 0

user1046334
user1046334

Reputation:

The int justHours = arr/60; seems to be incorrect, it should be int justHours = arr;.

Upvotes: 0

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