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56 lines
3.4 KiB
HTML
<p>Design a <code>Calculator</code> class. The class should provide the mathematical operations of addition, subtraction, multiplication, division, and exponentiation. It should also allow consecutive operations to be performed using method chaining. The <code>Calculator</code> class constructor should accept a number which serves as the initial value of <code>result</code>.</p>
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<p>Your <font face="monospace"><code>Calculator</code> </font>class should have the following methods:</p>
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<ul>
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<li><code>add</code> - This method adds the given number <code>value</code> to the <code>result</code> and returns the updated <code>Calculator</code>.</li>
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<li><code>subtract</code> - This method subtracts the given number <code>value</code> from the <code>result</code> and returns the updated <code>Calculator</code>.</li>
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<li><code>multiply</code> - This method multiplies the <code>result</code> by the given number <code>value</code> and returns the updated <code>Calculator</code>.</li>
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<li><code>divide</code> - This method divides the <code>result</code> by the given number <code>value</code> and returns the updated <code>Calculator</code>. If the passed value is <code>0</code>, an error <code>"Division by zero is not allowed"</code> should be thrown.</li>
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<li><code>power</code> - This method raises the <code>result</code> to the power of the given number <code>value</code> and returns the updated <code>Calculator</code>.</li>
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<li><code>getResult</code> - This method returns the <code>result</code>.</li>
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</ul>
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<p>Solutions within <code>10<sup>-5</sup></code> of the actual result are considered correct.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> actions = ["Calculator", "add", "subtract", "getResult"], values = [10, 5, 7]
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<strong>Output:</strong> 8
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<strong>Explanation:</strong>
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new Calculator(10).add(5).subtract(7).getResult() // 10 + 5 - 7 = 8
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> actions = ["Calculator", "multiply", "power", "getResult"], values = [2, 5, 2]
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<strong>Output:</strong> 100
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<strong>Explanation:</strong>
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new Calculator(2).multiply(5).power(2).getResult() // (2 * 5) ^ 2 = 100
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</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> actions = ["Calculator", "divide", "getResult"], values = [20, 0]
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<strong>Output:</strong> "Division by zero is not allowed"
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<strong>Explanation:</strong>
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new Calculator(20).divide(0).getResult() // 20 / 0
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The error should be thrown because we cannot divide by zero.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>2 <= actions.length <= 2 * 10<sup>4</sup></code></li>
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<li><code>1 <= values.length <= 2 * 10<sup>4</sup></code><code> - 1</code></li>
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<li><code>actions[i] is one of "Calculator", "add", "subtract", "multiply", "divide", "power", and "getResult"</code></li>
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<li><code><font face="monospace">Last action is always "getResult"</font></code></li>
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<li><code><font face="monospace">values is a JSON array of numbers</font></code></li>
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</ul>
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