Inserting an item into the stack when stack is not full is called …………. Operation and deletion of item from the stack, when stack is not empty is called ………..operation.
A) push, pop
B) pop, push
C) insert, delete
D) delete, insert
The correct answer and explanation is :
The correct answer is A) push, pop.
Explanation:
A stack is a linear data structure that follows the Last In, First Out (LIFO) principle. This means that the last element added to the stack is the first one to be removed. The two fundamental operations associated with a stack are:
- Push Operation:
- The push operation refers to inserting an item onto the stack. When the stack is not full, we can push an item onto the stack. This operation increases the size of the stack by one, adding an element to the top of the stack.
- A stack typically has a fixed maximum size, and the push operation is only successful if there is space available (i.e., the stack is not full). If the stack is full, an attempt to push an item will lead to a “stack overflow.”
- Pop Operation:
- The pop operation refers to deleting an item from the stack. It removes the item from the top of the stack, thereby decreasing the stack size by one. This operation is only allowed when the stack is not empty.
- If a pop operation is attempted on an empty stack, it can result in a “stack underflow” error, as there are no items left to remove.
Key Characteristics:
- Push and pop are the core operations that allow users to add and remove elements in a stack.
- Push occurs when you want to add an element to the stack, and it always adds it at the top of the stack (the most recently inserted position).
- Pop occurs when you want to remove an element from the stack, which always happens from the top as well, in accordance with the LIFO principle.
Why the other options are incorrect:
- B) pop, push: This is incorrect because the order of operations is reversed. Pop is for deletion (removal), and push is for insertion (adding).
- C) insert, delete: This is incorrect because these terms are more generic and are not specific to stack operations.
- D) delete, insert: Like option C, these terms are too general and don’t reflect the specific stack operations.
Thus, A) push, pop is the correct answer, as it accurately describes the operations of adding and removing items from a stack.