iPhone NSString -

i wanted know how can determine whether nsstring string has number.

you can use [nsnumberformatter numberfromstring: s]; , return nil if not number.

nsstring *s = @"2.5";  nsnumberformatter * formatter = [[nsnumberformatter alloc] init]; [formatter setnumberstyle:nsnumberformatterdecimalstyle]; nsnumber * num = [formatter numberfromstring:s]; [formatter release]; 

if num nil not number.

link docs on nsnumberformatterstyle