The stack container class provides the operation size to return the actual number of elements in the stack.
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Q17: The equivalent postfix expression for the infix
Q18: The postfix expression 6 3 + 2
Q19: The postfix expression 2 3 + 1
Q20: In the function evaluateOpr, two operands are
Q21: Stacks can be used to print a
Q23: A data structure in which the elements
Q24: We can perform the operation _ to
Q25: The operation _ is used to remove
Q26: The _ operation checks whether the stack
Q27: The _ operation checks whether the stack
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