Question

Guys what am I doing wrong?

if (numberstring.intValue <=15) {
    rankLabel.text = @"A1";
}
else if (numberstring.intValue >16 && <=40){       
    rankLabel.text = @"A2";
}

I get an error on the “<=40” ..

Answer 1

You missed off a variable reference:

if (numberstring.intValue <=15) {
    rankLabel.text = @"A1";
}                                  //        vv here vv
else if (numberstring.intValue >16 && numberstring.intValue <= 40){       
    rankLabel.text = @"A2";
}

As an optional extra, it looks like numberstring is an NSString object, which you are repeatedly converting to an integer in order to test various ranges. That operation is quite expensive, so you are better off doing the conversion once:

int value = [numberstring intValue];
if (value <=15) {
    rankLabel.text = @"A1";
}
else if (value >16 && value <= 40){       
    rankLabel.text = @"A2";
}

Also note that the intValue method is not a property so I would avoid using the Objective-C 2.0 dot syntax to access it and use the normal method calling mechanism.