Question

I have an NSString that I would like to add extra characters to. In my mind I thought it would be something simple like this:

NSString *answerString = [NSString stringWithFormat:@"%f", finalVolume] + @" Cubic Feet";

But that did not work. Does anyone know what I might be missing here? Thanks!

Answer 1

NSString is immutable, so you cannot just add to it. Instead, you either compose your string like this:

NSString *answerString = [NSString stringWithFormat:@"%f Cubic Feet", finalVolume];

or

NSString *unit = @"Cubic Feet";
NSString *answerString = [NSString stringWithFormat:@"%f %@", finalVolume, unit];

or create a mutable one:

NSMutableString *answerString = [NSMutableString stringWithFormat:@"%f ", finalVolume];
[answerString appendString:@"Cubic Feet"];