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116. When a stack is organized as an array, a variable named Top is used to point to the top element of the stack. Initially, the value of Top is set to_______to indicate an empty stack.

117. What happens when the stack is full and there is no space for a new element, and an attempt is made to push a new element?
(D).None of the above

118. The total number of elements in a stack at a given point of time can be calculated from the value of______.

119. A simple application of stacks is called_________.
(A).prefix notations
(B).Postfix notations
(C).Reverse strings
(D).None of the above

120. Jan Lukasiewicz, who suggested two alternative notations to represent an arithmetic expression belonged to which nationality?