Homework Help Forum: visual basic

Posted by Matrixschool on Tuesday, June 9, 2009 at 1:01pm.

(1) state the condition under which a FOR-TO-NEXT loop will not be executed. (2) With the aid of illustrative example, describe how a subroutine is implemented in BASIC.

• visual basic - MathMate, Tuesday, June 9, 2009 at 1:54pm

  You have not specified whether it is Visual Basic 6 or VB.net. In this case, the answers don't make a difference, but the versions will help to give a better context. 1. The format of the for-next loop statement is: FOR i = start TO finish, [STEP s] ... statements to be executed NEXT On entering the loop, if the initial value of finish is greater than start, the statements inside the loop will not be executed at all. However, if s is specified and is negative, the loop content will not be executed if start is less than finish. Examples where the loop will not execute are: FOR i=10 TO -1.... next FOR k=1 TO 10 STEP -5... next 2. Example: Here is an actual example from VB.net Sub keypressed(ByVal o As [Object], ByVal e As KeyPressEventArgs) If e.KeyChar = Microsoft.VisualBasic.ChrW(13) Or Char.IsDigit(e.KeyChar) Or e.KeyChar = Microsoft.VisualBasic.ChrW(7) Then e.Handled = True End If End Sub 'keypressed You can modify it according to your requirements for describing how subroutines are implemented. For a VB6 tutorial: http://www.vbtutor.net/vbtutor.html For a VB.net tutorial: http://www.homeandlearn.co.uk/NET/vbNET.html

  
  

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