Increment

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  13 years ago

  by acnetonline

  arne croughs

  Belgium, Belgium

  Joined 16 years ago

  Can someone explain me the difference between pre and post increment please?

   Thank you

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  13 years ago

  by jefftullin

  Jeff Tullin

  , United Kingdom

  Joined 13 years ago

  Assuming I understand what you are asking about,..

  For a variable called X,

  X++   is post incremented,

   ++X is pre-incremented.

  If these are the entire statements the end result is the same.

  X is greater than it was by the value of 1.

   

  However, it makes a difference if you do the increment in the same statement as an assignation.

  Thus, (assuming X starts with a value of 1)

  Y == X++;       

  ... results in Y holding 1  .. Y is given the value of X, THEN X is incremented. (POST)

  Y== ++X; 

  ...results in Y holding  2   ... the increment is done first, then the value is given to Y (PRE)

   

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  13 years ago

  by acnetonline

  arne croughs

  Belgium, Belgium

  Joined 16 years ago

  So in this case a pre incremented x will not be changed, only y will be given another value

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