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  Keyword:   if
 
  Syntax:    if( expression )
                  statement1
             [else
                  statement2]
 
  Summary:   Executes <statement1> if <expression> is true (nonzero);
             if else is present and <expression> is false (zero),
             executes <statement2>. After executing <statement1> or
             <statement2>, control passes to the next statement.
 
  See also:  switch
                                    -♦-