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SWAP exchanges the values of two variables.
 
SWAP variable1, variable2
 
Usage Notes
    ■ SWAP is an assignment statement that exchanges the values of two
      variables.
    ■ Any type of variable can be swapped (integer, long, single
      precision, double precision, string, currency, or record). However,
      if the two variables are not exactly the same type, BASIC generates
      the error message, "Type mismatch."