![]() ![]() at the back of the queue.ĭeletion / Removal of Element − This involves two conditions − If the Queue is empty no element is available for deletion i.e. ![]() FIFO means First in First Out type arrangement is followed in Queue data structure.Īddition / Appending of Element − This increases the queue size by the number of items added and Addition takes place at the rear end i.e. In stacks, objects are stored one after another, and these objects get removed in the order of the arrival i.e. We can also use input() function for user-based input system(Here I implemented static inputs ) Output Popped item is 4 The screen shown below depicts the output produced by the above program. The concept of framing the Stack remains the same in both cases. We can make a menu-driven program by providing choices to the user by using multiple if-else statements. The above code implements the Stack functionality in Python 3.x. If isEmpty(stk): # verifies whether the stack is empty or not Characteristics of StackĮxample Code def isEmpty(stk): # checks whether the stack is empty or notĭef Push(stk,item): # Allow additions to the stack Retrieving the value at the top of the Stack. We can also insert an additional functionality of peek i.e. Traversing /Displaying − This involves visiting each element of the stack and displaying on the screen.This reduces the size of the stack by the number of elements removed. ![]() Underflow occurs in the Stack or If the Stack has certain elements present in it then the element present at the top gets removed.
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