564NSData to NSString and vice versa

From NSData to NSString:
NSString *s = [[NSString alloc] initWithData:d encoding:NSUTF8StringEncoding];
And the other way round:
NSData *d = [s dataUsingEncoding:NSUTF8StringEncoding]:

305Converting float to string %4.2f

printf ("floats: %4.2f %+.0e %E \n", 3.1416, 3.1416, 3.1416); floats: 3.14 +3e+000 3.141600E+000


CGPoint CGPointMake ( CGFloat x, CGFloat y ); x, y has to be floats, passing only integers might not work. especially good to know, when and if ints get converted into floats. = CGPointMake(100.0f + someIntVar, 50.0f + anotherIntVar); ≠ CGPointMake(100 + someIntVar, 50 + anotherIntVar); this .0f seems to have a meaning after all.