title: what is actual difference between NSString and NSMutableString in objective C with the help of example?
body: <p>what is actual difference between NSString and NSMutable String in Objective-C?
  I have searched a lot but not getting any answer..I understand that NSString is Immutable object and NSMutableString is Mutable object but I want to understand the difference between them with the help of an example..Please help me..</p>
  
  <p>now question has solved..</p>