White BOX Test Engineer Interview Questions and Answers

Puzzle: On which day in November was the pond filled with half the ice?

• The amount of ice in the pond doubles each day in November

• The pond is filled with ice on the last day of November

• To find the day when the pond was half-filled, work backwards from the last day

Design a clock to know time in any region of the world with built-in calculation device.

• Create a clock with a world map and time zones marked on it.

• Use the built-in calculation device to calculate the time difference between the user's location and the desired location.

• Display the time in the desired location on the clock face.

• Allow the user to input the desired location using a keypad or touchscreen.

• Include a database of time zones and their offsets for accurate calculations...read more

Famous puzzles including measuring 4 liters from 3 and 5 liters and 3 bulbs and 3 switches.

• Measuring 4 liters puzzle involves filling 5 liter jug and transferring to 3 liter jug to get 4 liters

• 3 bulbs and 3 switches puzzle involves turning on one switch, waiting a few minutes, turning it off, and turning on another switch

• These puzzles test problem-solving skills and creativity

C function to sort an array in ascending order

• Use bubble sort algorithm to sort the array

• Create a function that takes array and its size as input

• Test cases: empty array, array with one element, array with duplicates

• Generalize the function by making it work for any array of integers

Test cases for Adobe Reader's save functionality

• Verify that the file is saved with the correct name and extension

• Check that the saved file can be opened and read without errors

• Test saving files with different sizes and formats

• Verify that the save dialog box appears when saving a file

• Check that the save operation can be cancelled without any issues

• Test saving files to different locations and verify that they are saved correctly

• Verify that the save operation does not overwrite ...read more

Test cases for mobile hardware and software in rural areas

• Test hardware durability in extreme weather conditions

• Test software compatibility with low network connectivity

• Test battery life in areas with limited access to electricity

• Test user interface for ease of use for non-tech savvy users

• Test audio and visual features for clarity in noisy environments

Convert a string from a2b2c5 to aabbccccc using C code and make it generalize.

• Use a loop to iterate through the string and check for digits.

• Create a new string and append the characters based on the digit count.

• Handle edge cases like single characters and non-digit characters.

• Test cases: 'a2b2c5' -> 'aabbccccc', 'a1b1c1' -> 'abc', 'a10b10c10' -> 'aaaaaaaaaabbbbbbbbbbcccccccccc'

A 3 digit number abc is to be found such that abc=a!+b!+c!

• The maximum value of a!+b!+c! for a 3 digit number is 9!+9!+9!= 2,177,280

• Therefore, we can start by checking all numbers from 100 to 999

• Calculate the factorials of each digit and check if their sum equals the number itself

• The only solution is 145, as 1!+4!+5!=145