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if                       if Statement

     if (expression)
          statement1;
     [else
          statement2;]

      Notes:    The parentheses are required around expression.

                Statement1 is executed when expression is TRUE (non
                zero).

  -------------------------------- Example ---------------------------------

           if (i < 4)
               process(SMALL);

           if (i < 4)
               process(SMALL);
           else if (i < 10)
               process(MEDIUM);

    An `else' always belongs to the most recent `if', so the second
    `else' in this next example--else process(LARGE)--belongs to:
    if (i < 10).

           if (i < 4)
               process(SMALL);
           else if (i < 10)
               process(MEDIUM);
           else
               process(LARGE);