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Pow(x, n) Test | Pre-employment assessment - Testlify
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Pow(x, n) Test

Overview of Pow(x, n) Test

The problem is to calculate the value of x raised to power of n.

Skills measured

  • maths

Available in



Coding Test


15 Mins





Use of Pow(x, n) test

The solution approach is to find the efficient solution for the "Pow(x, n)" problem, calculating the value of "x" raised to the power of "n." It employs the binary exponentiation technique to optimize the computation process, ensuring faster execution for large values of "n."

The function myPow takes a base x (a double) and an exponent n (an integer) as inputs. It initializes a long double variable ret to 1.0, representing the result of the exponentiation. Additionally, a long double variable pow_x is initialized with the value of x.

The core of the solution lies in the loop, which uses bitwise operations to efficiently perform the binary exponentiation. It iterates while the absolute value of n (stored as m) is not 0. In each iteration, the least significant bit of m is checked using the bitwise AND operator (m & 1). If it's 1, the value of pow_x is multiplied with ret. Then, pow_x is squared (pow_x = pow_x * pow_x) to prepare for the next iteration.

The loop advances by right-shifting m (dividing it by 2) in each iteration. This reduces the exponent by a factor of 2, effectively halving the number of iterations required.

Finally, the function returns the computed result, considering the sign of n. If n is positive, ret is returned; otherwise, the reciprocal of ret (1 divided by ret) is returned.

In summary, this solution efficiently calculates "x" raised to power "n" using binary exponentiation. The code's elegance and optimization make it suitable for handling large exponents while maintaining precision, which is crucial in various mathematical and computational contexts.

Relevant for

  • Software Developer Engineer
  • Software Developer
  • Software Engineers

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The math skill covered in Pow(x, n) is exponentiation. This function calculates the result of raising a given number x to the power of n. Exponentiation is an important concept in mathematics as it allows us to quickly and easily calculate the result of repeated multiplication. This skill is particularly useful in various fields such as physics, engineering, and computer science, where complex calculations involving large numbers are common. Understanding exponentiation helps in simplifying calculations and solving problems efficiently.

The Pow(x, n) test is created by a subject-matter expert

Testlify’s skill tests are designed by experienced SMEs (subject matter experts). We evaluate these experts based on specific metrics such as expertise, capability, and their market reputation. Prior to being published, each skill test is peer-reviewed by other experts and then calibrated based on insights derived from a significant number of test-takers who are well-versed in that skill area. Our inherent feedback systems and built-in algorithms enable our SMEs to refine our tests continually.

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