TCS Assistant System Engineer Interview Questions, Process, and Tips

malloc and calloc are functions used in C programming language to dynamically allocate memory.

• malloc stands for memory allocation and is used to allocate a block of memory of specified size.

• calloc stands for contiguous allocation and is used to allocate multiple blocks of memory of specified size.

• Both functions return a pointer to the first byte of the allocated memory.

• It is important to free the allocated memory using

A pointer in C is a variable that stores the memory address of another variable.

• Pointers are used to manipulate memory and create dynamic data structures.

• They can be used to pass values by reference to functions.

• Pointer arithmetic can be used to iterate over arrays and manipulate data.

• Null pointers are used to indicate that a pointer does not point to a valid memory address.

Java doesn't have pointers because of security and memory allocation issues.

• Java uses references instead of pointers.

• Pointers can cause security vulnerabilities and memory leaks.

• Java's garbage collector manages memory allocation automatically.

• Java's lack of pointers makes it more secure and easier to use than languages like C++.

A dangling pointer is a pointer that points to a memory location that has been deallocated or freed.

• Dangling pointers occur when a pointer is not set to NULL after the memory it points to is freed.

• Accessing a dangling pointer can lead to undefined behavior or crashes.

• Dangling pointers can be avoided by setting pointers to NULL after freeing the memory they point to.

Arrays offer constant time access and efficient memory usage, but have fixed size. Linked lists have dynamic size but slower access.

• Arrays provide constant time access to elements using index

• Arrays have efficient memory usage as they store elements in contiguous memory locations

• Arrays have a fixed size and cannot be easily resized

• Linked lists have dynamic size and can grow or shrink as needed

• Linked lists allow efficien...read more