Answer :

The output of an ADT stack for the peek operation is The number of items left on the stack.

The user can see the element at the top of the stack with the peek operation. This operation does not alter the stack in any way. Without removing the top object, the peek operation retrieves it. The ADT stack is unaffected by the peek operation.

The total number of elements on a data stack can be obtained from the built-in function QUEUED. For instance, you can use the QUEUED function with no arguments to determine the number of elements on the data stack.

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