Suppose an initially empty stack, S, has performed a total of 75 push() operations, 5 peek() operations and 10 pop operations, 4 of which returned null to indicate an empty stack. What is the current size of the stack, S? (Explain your answer/Show your workings)

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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Suppose an initially empty stack, S, has performed a total of 75 push() operations, 5 peek() operations and 10 pop operations, 4 of which returned null to indicate an empty stack. What is the current size of the stack, S? (Explain your answer/Show your workings) 

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