qb45advr.hlp (
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SWAP Statement Details
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SWAP Statement Details
Syntax
SWAP variable1,variable2
Any type of variable can be swapped (integer, long, single precision,
double precision, string, or record). However, the two variables must be
exactly the same type or an error message appears ("Type mismatch").
For example, trying to swap an integer with a single-precision value
produces a "Type mismatch" error.