The **`stack.pop()` function** in C++ removes the element that is available at the top of the stack.

Figure 1 shows the visual representation of the `stack.pop()` function.

In order to use the `stack.pop()` function, we must include `stack` in the program, as shown below:

```c++
#include <stack>
```
#   
## Syntax
```c++
stack_name.pop()
// where the stack_name is the name of the stack
```
## Parameter
This function does not require a parameter.

## Return value
This function returns the `element` that is available at the top of the stack and removes that `element` from the stack. 

## Example


#include <iostream>
//header file
#include <stack>
using namespace std;

int main() {
  stack<int> stack1;

    stack1.push(0);
    stack1.push(2);
    stack1.push(5);
    stack1.push(3);
    stack1.push(1);
    
    //stack1 = 1->3->5->2->0
    cout<<"The length of stack before pop: \n"<<stack1.size()<<"\n"; 
    
    stack1.pop();
    //after the pop stack1 = 3->5->2->0
    cout<<"The length of stack after pop: \n"<<stack1.size(); 


}

What is stack.pop() in C++?

Removes and returns the topmost element of the stack. Requires no parameters. Includes stack library.