rounding float to 'x' decimal places

[moonraker928]

is there a method in objective-c that can take:

float f = 4.000000;

and make it so that it only has one decimal place:

float f = 4.0;

??

[RickMaddy]

Is this for display purposes? There's no other reason to round a float otherwise.

To round it for display purposes you could do:

float f = 3.1415926;
NSString *str = [NSString stringWithFormat:@"%.1f", f];

where you can replace the '1' with however many decimal places you want to use.

[nacht]

The float, or the *output* of the float?

If you are looking to keep the "float" down to that size--complete with rounding--then what you want is NSDecimalNumber. This will allow you to do fixed precision arithmetic.

If you want to change the output, that's a slightly easier problem: Use [NSString stringWithFormat:@"%.1f,f]. The .1f comes straight of printf string formatting guidelines and there's a String Formatting Guide you can find in your documentation.

Hope that helps.

[Alexj17]

Originally Posted by RickMaddy

Is this for display purposes? There's no other reason to round a float otherwise.

To round it for display purposes you could do:

float f = 3.1415926;
NSString *str = [NSString stringWithFormat:@"%.1f", f];

where you can replace the '1' with however many decimal places you want to use.

This worked perfect thank you !