The **`stack.top()` function** in C++ is used to get the reference of the element at the top of the stack.

The following illustration shows a visual representation of the `stack.top()` function.

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

```c++
#include <stack>
```
#     
#  Syntax

```c++
stack_name.top()
// where the stack_name is the name of the stack
```
## Parameter

This function does not require a parameter.

## Return value

The `stack.top()` is used to get the reference of the element at the top of the stack. It does not remove that element from the stack.

##    
## Code

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

int main() {
  //filled stack
  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 top element of stack1: \n"<<stack1.top()<<"\n"; 

}

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

The stack.top() function in C++ returns a reference to the top element without removing it.