The __________ function (member of the istream class) is used to "unread" a single character.
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Q14: It is easier to insert and remove
Q15: The C++ standard requires that implementations of
Q16: Normally we write expressions using _ notation,
Q17: A calculator (or computer) normally scans an
Q18: The advantage of the _ form is
Q19: In a(n) _expression the operands precede the
Q21: According to the _ rule, operators with
Q22: Using the algorithm for converting an infix
Q23: The action of using function top to
Q24: _ are used to separate an expression
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