Qualcomm Interview Questions, Process, and Tips

Q1. Introduce Yourself.
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I am a dedicated Automation Engineer with a strong background in programming and problem-solving skills.
• Experienced in developing automated test scripts using tools like Selenium and Appium

• Proficient in programming languages such as Java, Python, and C#

• Skilled in identifying and resolving software defects to ensure high-quality products

• Familiar with Agile methodologies and continuous integration practices
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Q2. Basic programming and testing concepts.
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Q1. Detect endianness using C program
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Detect endianness using C program
• Use a union to create a variable with a known value

• Check the value of the first byte to determine endianness

• Big endian systems store the most significant byte first

• Little endian systems store the least significant byte first

• Example: union { int i; char c; } u; u.i = 1; if (u.c == 1) { /* Little endian */ } else { /* Big endian */ }
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Q2. Count set bits using C
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Count set bits in a number using C programming language.
• Use bitwise AND operation with 1 to check if the rightmost bit is set.

• Shift the number to the right by 1 bit each time to check all bits.

• Repeat the process until the number becomes 0, counting the set bits each time.
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Q1. Mostly on C, OS and wireless comm fundamentals.
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Q2. What does malloc return?
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malloc returns a pointer to a block of memory allocated from the heap.
• malloc returns a void pointer (void*)

• The returned pointer can be cast to the desired data type

• If malloc fails to allocate memory, it returns NULL
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Q3. What is RTOS and how does it differ from OS?
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RTOS stands for Real-Time Operating System. It is designed to handle time-sensitive tasks and provide deterministic behavior.
• RTOS is optimized for real-time applications that require precise timing and responsiveness.

• Unlike general-purpose operating systems, RTOS provides deterministic behavior, meaning tasks are guaranteed to be completed within a specific time frame.

• RTOS typically uses priority-based scheduling algor...read more
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Q4. Why not to use malloc?
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malloc should be avoided due to potential memory leaks and security vulnerabilities.
• malloc does not initialize memory, leading to potential bugs and crashes.

• It does not provide any bounds checking, leading to buffer overflows.

• Memory allocated with malloc must be explicitly freed with free() to avoid memory leaks.

• Using malloc can be less efficient than using stack memory for small allocations.

• Alternatives like calloc() ...read more
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Q5. What happens at stack/memory level when a null ptr is dereferenced?
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When a null pointer is dereferenced, it leads to a segmentation fault or access violation, causing the program to crash.
• Dereferencing a null pointer means trying to access the memory location pointed by the null pointer.

• This results in a segmentation fault or access violation, as the null pointer does not point to a valid memory address.

• The operating system detects the illegal memory access and terminates the program t...read more
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Q1. OOPs Concepts: Abstraction, Encapsulation, Inheritance , Polymorphism
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Q2. Count number of elements in an array in python.
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Use len() function to count number of elements in an array in Python.
• Use len() function with the array as argument to get the count of elements.

• Example: array = ['apple', 'banana', 'cherry'] Count = len(array) # Output: 3
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Q3. Merge two arrays in sorted order.
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Merge two sorted arrays nums1 and nums2 into nums1 in-place.
• Initialize pointers for nums1 and nums2 at the end of their elements

• Compare elements pointed by the two pointers and place larger element at end of nums1

• Repeat until all elements from nums2 have been merged into nums1
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Q4. Difference between list and tuple
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List is mutable, tuple is immutable in Python.
• List can be modified after creation, tuple cannot.

• List is defined using square brackets [], tuple using parentheses ().

• List is used for collections of items that may change, tuple for fixed collections.

• Example: list_example = [1, 2, 3], tuple_example = (4, 5, 6)
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Q5. One regex question and one file handling question in python
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Psuedo code of binary search. and some OOPs concept.