When you swap the values of two variables or array elements, you need a third variable, a temporary one, to hold one of the values until the swap is completed.

Name: When you swap the values of two variables or array elements, you need a third variable, a temporary one, to hold one of the values until the swap is completed.
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A temporary variable is needed to hold one of the values until the swap is completed.

When You Swap the Values of Two Variables or Array