I am getting input from user and convert to int . if input is not valid(has invalid chars etc) i need to ask user to re enter the number . Code (Text): ;get number jc displayErroMsg ; If value is not valid then display msg and ask user to re enter the value. ;I dunno where I need to put that displayErroMsg: . Also if user will enter invalid input i need to ask re enter the value continiously. I mean not only once ;I dunno where to put that label that jc will jump.