Objective C, Trim a float

Question

I have float like 3500,435232123. All I want to know if exists (in Objective C) a function that let me keep just the last 4 digits in my case is 2123.

Answer 1

You can use NSNumberFormatter

NSNumberFormatter *format = [[NSNumberFormatter alloc]init];
[format setNumberStyle:NSNumberFormatterDecimalStyle];
[format setRoundingMode:NSNumberFormatterRoundHalfUp];
[format setMaximumFractionDigits:4];
[format setMinimumFractionDigits:4];

string = [NSString stringWithFormat:@"%@",[format stringFromNumber:[NSNumber numberWithFloat:65.50055]] ;

Or simply

NSString *string = [NSString stringWithFormat:@"%.04f", floatValue];

If you want only last four digits, convert the float to a string

NSString *string = [NSString stringWithFormat:@"%f", floatValue];

and get the last four characters

NSString *lastFour = [string substringFromIndex: [string length] - 4];