L&T Technology Services Embedded Software Engineer Interview Questions and Answers

Embedded c 15 question and c language programming

Q1. Basically focaus on c laguage
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Q1. Mainly focused on basics of c language Stack program
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Q2. Compilation stages , function
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Q1. They generally asked about basic C question in pointers,function pointers,callback function
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Q2. Write a program on finding little or big endian,no of bits set in bit magic,
Ans. 
Program to find endianness and number of bits set in bit magic.
• Use bitwise operators to check endianness

• Count number of set bits using bitwise AND and right shift

• Use pre-defined functions for endianness in some programming languages

• Endianness can affect network communication and file formats
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Q3. Basic of rtos diff btw rtos and gpos core optimisation techniques used debug technique when fault occurs
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Q4. Basic IPC concepts used in operating system
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IPC stands for Inter-Process Communication and is used for communication between processes in an operating system.
• Shared memory

• Message passing

• Pipes

• Sockets

• Remote Procedure Calls (RPC)

• Semaphores

• Mutexes
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Q1. The test had three sections: 10 - Aptitude questions 15 - C programming Mcq 3 - C programming coding questions
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Q1. Introduction. Difference between Embedded Systems and Embedded software. Difference between linux and windows. Why use microcontroller instead of microprocessor. C programming: structure and union, poi...read more
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Interview questions for Embedded Software Engineer
• Embedded systems are hardware and software combined to perform a specific task

• Embedded software is the software component of an embedded system

• Linux is open-source, customizable, and widely used in embedded systems

• Windows is proprietary, less customizable, and not commonly used in embedded systems

• Microcontrollers have built-in memory and peripherals, making them more su...read more
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Q1. Reverese a 32 byte number
Ans. 
To reverse a 32 byte number, swap the first and last byte, second and second last byte, and so on.
• Iterate through the first half of the number and swap each byte with its corresponding byte from the second half.

• Use bitwise operations to swap the bytes.

• Convert the number to a string, reverse the string, and convert it back to a number.
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Q2. What is Macro?, how to store just 5 bits inside of a charecter? Dangling Pointers? Inline function?
Ans. 
Macro is a preprocessor directive that performs text substitution. Storing 5 bits in a character can be done using bit manipulation. Dangling pointers are pointers that point to invalid memory locations. Inline functions are functions that are expanded by the compiler at the point of call.
• Macros are used to define constants or to perform text substitution

• To store 5 bits in a character, we can use bit manipulation opera...read more
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