How to print a double with full precision on iOS?

Question

Test case:

NSLog(@\"%f\", M_PI);
NSLog(@\"%@\", [NSString stringWithFormat:@\"%f\", M_PI]);
NSLog(@\"%@\", [NSNumber numberWithDouble:M_PI]);

Answer 1

NSLog(@"%@", [NSDecimalNumber numberWithDouble:M_PI]); 

a little more precision