Round doubles in Objective-C

Question

I have double number in a format like 34.123456789. How can I change it to 34.123?

I just want 3 digits after the decimal point.

Answer 1

The approved solution has a small typo. It's missing the "%".

Here is the solution without the typo and with a little extra code.

double d = 1.23456;
NSString* myString = [NSString stringWithFormat:@"%.3f",d];

myString will be "1.234".