Hubbell Embedded Firmware Engineer Interview Questions and Answers

Implement stack data structure

• Use an array or linked list to store elements

• Push operation adds element to top of stack

• Pop operation removes element from top of stack

• Peek operation returns top element without removing it

Global variables are accessible from any part of the program and can be modified by any function.

• Global variables are declared outside of any function.

• They can be accessed and modified by any function in the program.

• If a function modifies the value of a global variable, the new value is visible to all other functions.

• Global variables can be useful for sharing data between functions.

• However, overuse of global variables

Program to transpose a matrix

• Iterate through rows and columns of the matrix

• Swap the elements at (i,j) and (j,i) positions

• Return the transposed matrix

Pre and post fix operators are used to increment or decrement a value before or after it is used in an expression.

• Pre-fix operator (++x) increments the value of x and returns the new value.

• Post-fix operator (x++) returns the value of x and then increments it.

• Both operators can be used with variables of numeric data types.

• They can also be used with pointers to increment or decrement the memory address they point to.

C is a procedural programming language while Java is an object-oriented programming language.

• C is a low-level language while Java is a high-level language.

• C requires manual memory management while Java has automatic memory management.

• C is platform-dependent while Java is platform-independent.

• C supports pointers while Java does not.

• C has a simpler syntax compared to Java.

final, finally, and finalize are keywords in Java with different meanings.

• final is a keyword used to declare a constant value, a variable that cannot be modified.

• finally is a block used in exception handling to ensure a piece of code is always executed, whether an exception is thrown or not.

• finalize is a method in the Object class that is called by the garbage collector before an object is destroyed.

• final and finally a...read more

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