二进制表达式错误的操作数无效

Question

I'm trying to write this swift line in Objective-C.

Swift

timeRemainingLabel.text = String(format: "%02d:%02d", ((lround(timeRemaining) / 60) % 60), lround(timeRemaining) % 60)

Objective-C

timeRemainingLabel.text = [NSString stringWithFormat:@"%02d:%02d", ((roundf(timeRemaining) / 60) % 60), roundf(timeRemaining) % 60];

But it gives this error:

Invalid operand to binary expression Error.('float' and 'float')

How to fix this?

Answer 1

You need to cast the results of roundf into integers. Your line should look something like this

timeRemainingLabel.text = [NSString stringWithFormat:@"%02d:%02d", (((int)roundf(timeRemaining) / 60) % 60), (int)roundf(timeRemaining) % 60];

Edit: The working answer from a comment:

CGFloat timeRemaining = 109.13;
NSString *string = [NSString stringWithFormat:@"%02d:%02d", ((int)(roundf(timeRemaining) / 60) % 60), ((int)roundf(timeRemaining) % 60)];
NSLog(@"String = %@", string);

Answer 2

try dividing with decimal value. i.e. **/60.0f** instead of **/60**

timeRemainingLabel.text = [NSString stringWithFormat:@"%02d:%02d", ((roundf(timeRemaining) / 60) % 60), roundf(timeRemaining) % 60];

Answer 3

try this :

CGFloat timeRemaining = 109.13;
NSString *string = [NSString stringWithFormat:@"%02d:%02d", ((int)(roundf(timeRemaining) / 60) % 60), ((int)roundf(timeRemaining) % 60)];
NSLog(@"String = %@", string);