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String to Integer Test | Pre-employment assessment - Testlify
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String to Integer Test

Overview of String to Integer Test

The goal is to implement atoi function which converts a string to an integer.

Skills measured

  • String
  • greedy

Available in



Coding Test


20 Mins





Use of String to Integer test

The intuition behind the solution is to use the atol function to convert the string to a long long value, which can handle a wider range of integers. Then, the solution performs range checks to ensure the converted value does not exceed the range of an int. If the converted value exceeds the range, it is capped to the maximum or minimum value accordingly.
The myAtol function takes a string str as input and returns an integer.

The function first checks if the input string str is empty. If it is, it means there is no valid integer to convert, so it returns 0 as the result.

The function declares a variable ret of type long long to store the converted integer value. Using long long ensures that we can handle large integer values.

The function then uses the atol function to convert the string str to a long long value. The atol function converts a C-style string to a long long integer. str.c_str() is used to obtain a C-style string from the input string str.

After converting the string to a long long value, the function performs range checks. It checks if ret is greater than INT_MAX, which represents the maximum value an int can hold. If ret is greater than INT_MAX, it sets ret to INT_MAX.

Similarly, it checks if ret is less than INT_MIN, which represents the minimum value an int can hold. If ret is less than INT_MIN, it sets ret to INT_MIN.

Finally, it returns the converted integer value ret.

Relevant for

  • Software Developer Engineer
  • Software Developer
  • Software Engineers

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One important string skill covered in String to Integer is the ability to convert a string representation of a number into an actual integer value. This skill is crucial for handling user input in applications where numerical data needs to be processed or manipulated. By converting strings to integers, developers can perform mathematical operations, compare values, and store data in a more efficient and structured way. Additionally, converting strings to integers helps ensure data integrity and accuracy, as it eliminates potential errors that may occur when working with string data.



The greedy skill covered in String to Integer is essential for efficiently converting a string representation of a number into an integer. By greedily parsing the characters of the string and building the integer one digit at a time, unnecessary operations and iterations are minimized, resulting in a faster conversion process. This skill is important as it helps optimize the algorithm for converting strings to integers, making it more efficient and improving overall performance. Mastering this skill can greatly enhance the effectiveness of string manipulation tasks in programming.

The String to Integer 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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