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📁 《Big C++ 》Third Edition电子书和代码全集-Part1

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<h2><font color="#009999">23.3 (cont.) - <tt>stack</tt> Example</font></h2>
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<p><i>Reverse Polish Notation</i> (RPN, or <i>postfix</i>) calculator</p>

<ul>
	<li>Arguments written before operators
		<ul>
			<li><tt>3 + 4 * 7</tt> would be <tt>3 4 7 * +</tt></li>
		</ul>
	</li>
	<li>Calculation is easy:</li>
		<ul>
			<li>Each argument read is pushed onto a stack</li>
			<li>If a (binary) operator is read:
				<ul>
					<li>Pop top two values</li>
					<li>Perform appropriate operation</li>
					<li>Push result back onto stack</li>
				</ul>
			<li>Add 2 commands:
				<ol>
					<li><tt>p</tt> - print the top of the stack</li>
					<li><tt>q</tt> - quit the program</li>
				</ol>
		</ul>
	</li>
</ul>

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