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+<h2><a href="https://leetcode.com/problems/final-value-of-variable-after-performing-operations">2137. Final Value of Variable After Performing Operations</a></h2><h3>Easy</h3><hr><p>There is a programming language with only <strong>four</strong> operations and <strong>one</strong> variable <code>X</code>:</p>
+
+<ul>
+	<li><code>++X</code> and <code>X++</code> <strong>increments</strong> the value of the variable <code>X</code> by <code>1</code>.</li>
+	<li><code>--X</code> and <code>X--</code> <strong>decrements</strong> the value of the variable <code>X</code> by <code>1</code>.</li>
+</ul>
+
+<p>Initially, the value of <code>X</code> is <code>0</code>.</p>
+
+<p>Given an array of strings <code>operations</code> containing a list of operations, return <em>the <strong>final </strong>value of </em><code>X</code> <em>after performing all the operations</em>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> operations = [&quot;--X&quot;,&quot;X++&quot;,&quot;X++&quot;]
+<strong>Output:</strong> 1
+<strong>Explanation:</strong>&nbsp;The operations are performed as follows:
+Initially, X = 0.
+--X: X is decremented by 1, X =  0 - 1 = -1.
+X++: X is incremented by 1, X = -1 + 1 =  0.
+X++: X is incremented by 1, X =  0 + 1 =  1.
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> operations = [&quot;++X&quot;,&quot;++X&quot;,&quot;X++&quot;]
+<strong>Output:</strong> 3
+<strong>Explanation: </strong>The operations are performed as follows:
+Initially, X = 0.
+++X: X is incremented by 1, X = 0 + 1 = 1.
+++X: X is incremented by 1, X = 1 + 1 = 2.
+X++: X is incremented by 1, X = 2 + 1 = 3.
+</pre>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> operations = [&quot;X++&quot;,&quot;++X&quot;,&quot;--X&quot;,&quot;X--&quot;]
+<strong>Output:</strong> 0
+<strong>Explanation:</strong>&nbsp;The operations are performed as follows:
+Initially, X = 0.
+X++: X is incremented by 1, X = 0 + 1 = 1.
+++X: X is incremented by 1, X = 1 + 1 = 2.
+--X: X is decremented by 1, X = 2 - 1 = 1.
+X--: X is decremented by 1, X = 1 - 1 = 0.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= operations.length &lt;= 100</code></li>
+	<li><code>operations[i]</code> will be either <code>&quot;++X&quot;</code>, <code>&quot;X++&quot;</code>, <code>&quot;--X&quot;</code>, or <code>&quot;X--&quot;</code>.</li>
+</ul>