What does the ‘NULL’ keyword represent in C? a) A zero value b) A pointer that does not point to any object or function c) An undefined value d) A memory address Answer: b) A pointer that does not point to any object or function Explanation: In C, the NULL keyword represents a pointer that […]
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What is the purpose of the ‘sizeof’ operator in C? a) To determine the size of a variable or data type b) To allocate memory dynamically c) To find the length of a string d) To initialize an array Answer: a) To determine the size of a variable or data type Explanation: The sizeof operator
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In C, which operator is used for pointer-to-pointer relationships? a) & (ampersand) b) * (asterisk) c) -> (arrow) d) [] (brackets) Answer: b) * (asterisk) Explanation: In C, the asterisk (*) operator is used to declare and manipulate pointers, including pointer-to-pointer relationships. A pointer-to-pointer is essentially a pointer that stores the address of another pointer.
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Which data type is used to store a sequence of characters in C? a) int b) char c) float d) array of char Answer: d) array of char Explanation: In C, a sequence of characters is stored in an array of char data type. Strings in C are represented as arrays of characters, with the
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What is the purpose of the ‘const’ keyword in C? a) To declare a constant variable that cannot be changed b) To define a function c) To declare a loop variable d) To return a value from a function Answer: a) To declare a constant variable that cannot be changed Explanation: The const keyword in
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Which operator is used to compare two values for equality in C? a) == b) = c) != d) >> Answer: a) == Explanation: In C, the == operator is used to compare two values for equality. It returns true if the values are equal and false otherwise. This operator is commonly used in conditional
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What is the purpose of the ‘continue’ statement in a loop? a) To exit the loop immediately b) To skip the current iteration and continue with the next one c) To break out of the loop d) To start the loop again from the beginning Answer: b) To skip the current iteration and continue with
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Which character is used to represent a comment in C code? a) # b) // c) /* */ d) Both b and c Answer: d) Both b and c Explanation: In C, comments can be represented in two ways. Single-line comments are written using //, while multi-line comments are enclosed within /* */. Comments are
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What does the ‘void’ keyword indicate in a C function declaration? a) The function returns an integer b) The function returns a floating-point number c) The function does not return a value d) The function returns a string Answer: c) The function does not return a value Explanation: In C, the void keyword in a
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Java MCQ: In a Doubly Linked List, what does the first node’s previous pointer point to? A) The second node B) The last node C) Itself D) Null Answer: D) Null Explanation: In a Doubly Linked List, the first node’s previous pointer points to null. This indicates that the first node does not have any
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Java MCQ: In a Singly Linked List, what does the last node’s next pointer point to? A) The first node B) The second last node C) Null D) Itself Answer: C) Null Explanation: In a Singly Linked List, the last node’s next pointer points to null, indicating the end of the list. The null pointer
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Java MCQ: What is the primary advantage of a Circular Linked List over a Simple Linked List? A) It uses less memory B) It allows for O(1) insertions at the end of the list C) It allows us to traverse the whole list starting from any node D) It does not require a sentinel node
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Java MCQ: What is the time complexity of searching for an element in a Linked List? A) O(1) B) O(log n) C) O(n) D) O(n log n) Answer: C) O(n) Explanation: The time complexity for searching an element in a Linked List is O(n), where ‘n’ is the number of elements in the list. This
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Java MCQ: In which scenario is the Linked List an excellent data structure? A) When you need to insert elements at the end of the list B) When you need to insert elements in the middle of the list C) When you need to access elements in sequential order D) When you need quick access
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Java MCQ: What is a Doubly Linked List in data structure? A) It is a type of linked list where each node contains a data field and two references, one to the next node and one to the previous node. B) It is a type of linked list where each node contains a data field
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Java MCQ: What is a Linked List in data structure? A) It is a linear data structure where each element is stored at a contiguous location and elements are accessed sequentially from the first element. B) It is a type of data structure that consists of nodes, where each node contains a data field and
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Java MCQ: What is a circular queue? A) A queue where the last element points to the first B) A queue where the first element points to the last C) A queue that can only hold circular objects D) None of the above Answer: A) A queue where the last element points to the first
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Java MCQ: What is the time complexity to get the front element from the queue? A) O(1) B) O(n) C) O(n log n) D) O(n²) Answer: A) O(1) Explanation: The time complexity to get the front element from a queue is O(1), meaning it is performed in constant time. This operation, typically done using the
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Java MCQ: Which is a type of Queue? A) Priority Queue B) LIFO Queue C) FILO Queue D) None of the above Answer: A) Priority Queue Explanation: A priority queue is a type of queue where each element is associated with a priority. Elements with higher priority are dequeued before elements with lower priority, regardless
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Java MCQ: What is the front of a Queue? A) The last element added B) The first element added C) The middle element D) None of the above Answer: B) The first element added Explanation: The front of a queue refers to the first element that was added to the queue. In a queue, elements
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Java MCQ: Is a Queue a dynamic data structure? A) Yes B) No Answer: A) Yes Explanation: Yes, a queue is a dynamic data structure because its size can change during the execution of a program. Unlike static data structures, where the size is fixed at compile-time, a dynamic queue can grow or shrink as
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Java MCQ: What is the time complexity of enqueue operation in a queue? A) O(n) B) O(n log n) C) O(1) D) O(n²) Answer: C) O(1) Explanation: The time complexity of the enqueue operation in a queue is O(1), meaning that the operation is performed in constant time, regardless of the number of elements in
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Java MCQ: What does ‘underflow’ mean in a Queue? A) Queue is full B) Queue is empty C) There is an error in the queue D) Queue has only one element Answer: B) Queue is empty Explanation: ‘Underflow’ in a queue refers to a situation where an attempt is made to remove an element from
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Java MCQ: What is the operation to remove an element from the Queue? A) Push B) Pop C) Enqueue D) Dequeue Answer: D) Dequeue Explanation: The operation used to remove an element from a queue is called “dequeue.” The dequeue operation removes the element from the front of the queue, which is the first element
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Java MCQ: Which operation is used to add an element in the Queue? A) Push B) Pop C) Enqueue D) Dequeue Answer: C) Enqueue Explanation: The operation used to add an element to a queue is called “enqueue.” The enqueue operation adds an element to the rear (or end) of the queue, following the FIFO
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