Practice/Microsoft/Leetcode 2726. Calculator with Method Chaining

Leetcode 2726. Calculator with Method Chaining

CodingMust

Problem

Design and implement a FluentCalculator class that enables chained mathematical operations through a fluent interface pattern. The calculator should maintain an internal state representing the current calculated value and allow multiple operations to be performed in sequence by returning the calculator instance itself from each operation method.

The class must support the following operations: addition, subtraction, multiplication, division, and exponentiation (power). Each operation should modify the internal state and return the calculator object to enable method chaining. A final method should retrieve the computed result.

Requirements

1. Implement a constructor that accepts an initial numeric value
2. Implement an add(value) method that adds the given value to the current result
3. Implement a subtract(value) method that subtracts the given value from the current result
4. Implement a multiply(value) method that multiplies the current result by the given value
5. Implement a divide(value) method that divides the current result by the given value
6. The divide method must throw an exception with the message "Division by zero is not allowed" when the divisor is 0
7. Implement a power(value) method that raises the current result to the given exponent
8. All arithmetic methods (add, subtract, multiply, divide, power) must return the calculator instance to enable chaining
9. Implement a get_result() method that returns the final calculated value
10. The calculator should handle floating-point arithmetic correctly

Constraints

• All input values will be valid numbers (integers or floats)
• The initial value can be any real number
• Results within 1e-5 of the expected value should be considered correct due to floating-point precision
• Division by zero is the only error condition that needs explicit handling

Examples

Example 1:

Input: FluentCalculator(10).add(5).subtract(3).get_result() Output: 12 Explanation: Start with 10, add 5 to get 15, subtract 3 to get 12

Example 2:

Input: FluentCalculator(2).multiply(3).power(2).get_result() Output: 36 Explanation: Start with 2, multiply by 3 to get 6, raise to power 2 to get 36

Example 3:

Input: FluentCalculator(100).divide(4).add(10).multiply(2).get_result() Output: 70 Explanation: Start with 100, divide by 4 to get 25, add 10 to get 35, multiply by 2 to get 70

Example 4:

Input: FluentCalculator(5).divide(0) Output: Exception raised Explanation: Attempting to divide by zero throws an exception