Sigmasoft Infotech Senior Software Engineer Interview Questions and Answers

Answers to questions related to software engineering concepts.

• Volatile is a keyword used to indicate that a variable's value can be changed unexpectedly.

• Constant is a keyword used to indicate that a variable's value cannot be changed once it is assigned.

• Volatile and const can be used together to indicate that a variable's value cannot be changed and that it may change unexpectedly.

• ISR stands for Interrupt Service Routi...read more

A pointer is a variable that stores the memory address of another variable. Dangling, null, and void pointers are types of pointers.

• Dangling pointer: a pointer that points to a memory location that has been deallocated or freed

• Null pointer: a pointer that does not point to any memory location

• Void pointer: a pointer that has no specific data type and can point to any data type

Storage classes in C define the scope and lifetime of variables.

• auto: default storage class for local variables

• register: stores variables in CPU registers for faster access

• static: retains value between function calls

• extern: used to access global variables across multiple files

CAN data frame is a message format used in Controller Area Network (CAN) protocol.

• CAN data frame consists of 7 fields: Start of Frame (SOF), Arbitration ID, Control Bits, Data Length Code (DLC), Data Field, Cyclic Redundancy Check (CRC), and End of Frame (EOF).

• The Arbitration ID field is used to identify the message priority and the source of the message.

• The Data Field can contain up to 8 bytes of data.

• The CRC field is...read more