HCLTech Embedded Software Engineer Interview Questions and Answers

It is not possible to enter if and else at the same time in a programming language.

• If and else are conditional statements that are mutually exclusive.

• They are used to execute different blocks of code based on a condition.

• To execute multiple blocks of code simultaneously, you can use nested if-else statements or logical operators.

Structure is a collection of variables of different data types while union is a collection of variables of same data type.

• Structure allocates memory for all its variables while union allocates memory for only one variable at a time.

• Structure is used when we want to store different types of data while union is used when we want to store only one type of data at a time.

• Structure is accessed using dot (.) operator while union is accessed using arrow (->) operator.

• Example of stru...read more

Different types of pointers, volatile variable, storage classes, Static and extern keywords, ISR

• Pointers: Null pointer, void pointer, function pointer

• Volatile variable: Used to indicate that a variable may be changed by external factors

• Storage classes: auto, register, static, extern

• Static keyword: Used to declare variables that are only accessible within the same file

• Extern keyword: Used to declare variables that are defined in another file

• ISR: Interrupt Service Routine, a fu...read more

Program to find factorial of a number

• Use a loop to multiply the number with all the numbers less than it

• Handle the case when the number is 0 or 1 separately

• Use recursion to find factorial of a number

Use sorting to find the nth largest number in a jumbled array.

• Sort the array in descending order.

• Access the nth element in the sorted array to find the nth largest number.

Recursion is a process where a function calls itself until a base condition is met.

• Recursion involves breaking down a problem into smaller subproblems and solving them recursively

• It requires a base case to stop the recursion and prevent infinite looping

• Example: Factorial function - n! = n * (n-1)!, where the function calls itself with n-1 until n=1

Blinking an LED using bare metal code involves directly manipulating hardware registers without an operating system.

• Access the GPIO register for the specific pin connected to the LED

• Set the pin as an output

• Toggle the pin state at regular intervals to create the blinking effect

C programming memory structure involves stack, heap, data, and code segments.

• Stack: Used for local variables and function call management.

• Heap: Used for dynamic memory allocation.

• Data: Contains global and static variables.

• Code: Contains the program's executable code.