add leetcode problem-cn part2

算法题（国内版）/problem (English)/计算器(English) [calculator-lcci].html

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+<p>Given an arithmetic equation consisting of positive integers, +, -, * and / (no paren&shy;theses), compute the result.</p>
+
+<p>The expression string contains only non-negative integers, +, -, *, / operators and empty spaces . The integer division should truncate toward zero.</p>
+
+<p><strong>Example&nbsp;1:</strong></p>
+
+<pre>
+<strong>Input: </strong>&quot;3+2*2&quot;
+<strong>Output:</strong> 7
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> &quot; 3/2 &quot;
+<strong>Output:</strong> 1</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> &quot; 3+5 / 2 &quot;
+<strong>Output:</strong> 5
+</pre>
+
+<p><strong>Note:</strong></p>
+
+<ul>
+	<li>You may assume that the given expression is always valid.</li>
+	<li>Do not use the eval built-in library function.</li>
+</ul>