Ufdjrw

Hi i was wondering if anyone could help me. im stuck in a dead end here. I dont know how to make a peek and working pop function. i need assistance.

here is my code so far:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp13

 class Program
 



 int nextFree;
 int End;
 int Start;

 Names[] Stack;
 Names steven = new Names();
 Names jacques = new Names();
 Names samantha = new Names();
 Names lilly = new Names();




 public struct Names
 
 public Int32 pointer;
 public string data;
 

 static void Main(string[] args)
 

 Program prog = new Program();
 do
 
 prog.DisplayMenu();
 
 while (true);
 

 public void DisplayMenu()
 
 Int32 userInput = 0;

 Console.WriteLine("Enter number of choice:");
 Console.WriteLine("=======================");
 Console.WriteLine("1: Sign up for consultation");
 Console.WriteLine("2: Begin consultation");
 Console.WriteLine("3: Enter room");
 Console.WriteLine("4: Closing time");
 Console.WriteLine("5: Exit");
 userInput = Int32.Parse(Console.ReadLine());


 switch (userInput)
 
 case 1:
 this.Push();
 break;
 case 2:
 this.Pop();
 break;





 case 5:
 System.Environment.Exit(1);
 break;
 

 

 public Program()
 
 Stack = new Names[20];

 steven.data = "Steven";
 steven.pointer = 1;

 jacques.data = "Jacques";
 jacques.pointer = 2;

 samantha.data = "Samantha";
 samantha.pointer = 3;

 lilly.data = "Lilly";
 lilly.pointer = -1;




 Stack[0] = steven;
 Stack[1] = jacques;
 Stack[2] = samantha;
 Stack[3] = lilly;
 nextFree = 4;
 End = 20;
 Start = 0;
 


 public string Pop()
 

 string value = string.Empty;

 if (nextFree == -1)
 
 Console.WriteLine("Stack is empty");
 Console.ReadLine();
 
 else
 

 Names thisNode = Stack[End];
 int temp = End;
 End = thisNode.pointer;
 thisNode.pointer = nextFree;
 nextFree = temp;




 
 this.ListAllNames();
 return value;
 









 public void Push()
 
 if (nextFree >= Stack.Length)
 
 Console.WriteLine("Stackoverflow, to many elements for the stack");
 Console.ReadLine();
 
 else
 
 Console.WriteLine("Enter a name to be added");
 string input = Console.ReadLine();
 Stack[nextFree].data = input;
 Stack[nextFree].pointer = End;
 End = nextFree;
 nextFree++;
 
 this.ListAllNames();

 


 public void ListAllNames()
 
 foreach (Names name in Stack)
 
 Console.WriteLine("Name:" + name.data);
 
 


 
 

as you can see it is unfinished. im at a standstill and cannot move one.
I have trouble in using the elements here so that i could make a function such as peek and pop properly.