Stack represents a last-in, first out collection of object. It is used when you need a last-in, first-out access to items. When you add an item in the list, it is called pushing the item and when you remove it, it is called popping the item. Creation of stack means the addition of item into the stack. Stack<T>.Push(Object) Method is used to Inserts an object at the top of the Stack.
- The capacity of a Stack is the number of elements the Stack can hold. As elements are added to a Stack, the capacity is automatically increased as required through reallocation.
- If Count is less than the capacity of the stack, Push is an O(1) operation. If the capacity needs to be increased to accommodate the new element, Push becomes an O(n) operation, where n is Count. Pop is an O(1) operation.
- Stack accepts null as a valid value and allows duplicate elements.
public virtual void Push (object obj);
obj: The Object of type System.Object which is to push onto the Stack<T>. The value can be null.
Below given are some examples to understand the implementation in a better way :
Total number of elements in the Stack 1 are : 5 website best the is GeeksforGeeks Total number of elements in the Stack 2 are : 5 GeeksforGeeks is the best website
Total number of elements in the Stack 1 are : 5 25 20 15 10 5 Total number of elements in the Stack 2 are : 5 5 10 15 20 25