Convert unsigned long to float with 2 precision decimal value

Question

I am trying to convert the value to float with 2 precision decimal format.

NSString* formattedNumber = [NSString stringWithFormat:@"%.2lu", (unsigned long)users.count];
float totalRatingCount = atof([formattedNumber UTF8String]);

This gives me values such as

1.000000
2.000000
3.000000

What I want is the following

1.00
2.00
3.00

Where am i going wrong?

Answer 1

A float has no precision value, it's not a fixed point value. However, there is an easier way to convert to float:

CGFloat totalRating = [formattedNumber floatValue];

to print a float with 2dp's of precision, use the format string @"%.02f"

Answer 2

You need to use %.2f format specifier as

NSString* formattedNumber = [NSString stringWithFormat:@"%.2f", (float)users.count];
float totalRatingCount = atof([formattedNumber UTF8String]);

and you'll get the desired out put with 2 values precision after decimal.

Answer 3

Using NSNumberFormatter, you can rounding number up to two digit.
double d = 12.1278;

NSNumberFormatter *formatter = [NSNumberFormatter new];
[formatter setRoundingMode:NSNumberFormatterRoundFloor];
[formatter setMinimumFractionDigits:2];
[formatter setMaximumFractionDigits:2];
NSString *numberString = [formatter stringFromNumber:@(d)];

NSLog(@"numberString: %@", numberString);

Output is :

numberString: 12.12

Answer 4

Try this:

NSNumber *number = [NSNumber numberWithFloat:(unsigned long)users.count];
NSNumberFormatter* nf=[[NSNumberFormatter alloc]init];
nf.minimumFractionDigits=2;
nf.maximumFractionDigits=2;
NSString* str = [nf stringFromNumber:number];
NSLog(@"%@",str);