Samsung Software Engineer Interview Questions and Answers

new() is an operator in C++ used for dynamic memory allocation.

• new() returns a pointer to the allocated memory.

• It can be used to allocate memory for primitive data types, arrays, and objects.

• Memory allocated using new() must be deallocated using delete operator.

• Example: int *ptr = new int;

• Example: int *arr = new int[10];

• Example: MyClass *obj = new MyClass();

Self referential structure is a structure that contains a pointer to the same type of structure.

• It allows a structure to reference itself within its own definition.

• It is commonly used in linked lists, trees, and graphs.

• Example: struct Node { int data; struct Node *next; };

• Here, the Node structure contains a pointer to another Node structure.

Structure and union are data structures in C language. Union stores only one value at a time while structure stores multiple values.

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

• Structure allocates memory for all its members while union allocates memory for only the largest member.

• Structure is used when we want to store multiple values of different data t...read more

malloc and new are used to allocate memory dynamically. Malloc is faster but new is safer.

• malloc is a C function while new is a C++ operator

• malloc only allocates memory while new also initializes the memory

• new throws an exception if allocation fails while malloc returns NULL

• malloc is faster because it does not involve constructor calls

• new is safer because it ensures type safety and prevents memory leaks

Accessing static variables from another file is not straightforward due to their limited scope.

• Static variables have file scope, meaning they are only accessible within the file they are declared in.

• To access a static variable from another file, you can use functions to expose its value.

• Example: If 'static int count;' is in file A.c, create a function 'int getCount()' in A.c to return its value.

• Include A.h in the ...read more

Cannot modify value pointed by p, but can change the address it points to.

• p is a pointer to a constant integer with value 5

• a) is valid as p can point to a non-constant integer

• b) is invalid as *p is a constant and cannot be modified