using System;
class Stack {
int length = 0;
string[] values;
static void Main() {
Console.WriteLine("Hello World!");
Stack myStack = new Stack();
Console.WriteLine("myStack: " + myStack.ToString());
myStack.Push("Discord");
Console.WriteLine("myStack: " + myStack.ToString());
myStack.Push("Udemy");
Console.WriteLine("myStack: " + myStack.ToString());
myStack.Push("Google");
Console.WriteLine("myStack: " + myStack.ToString());
Console.WriteLine("myStack.Peek(): " + myStack.Peek());
Console.WriteLine("myStack: " + myStack.ToString());
myStack.Pop();
Console.WriteLine("myStack: " + myStack.ToString());
myStack.Pop();
Console.WriteLine("myStack: " + myStack.ToString());
myStack.Pop();
Console.WriteLine("myStack: " + myStack.ToString());
}
public Stack() {
this.values = new string[50];
}
public void Push(string value) {
this.values[this.length] = value;
this.length++;
}
public string Pop() {
if (this.length > 0) {
this.length--;
return this.values[this.length];
}
return null;
}
public string Peek() {
if (this.length > 0) {
return this.values[this.length-1];
}
return null;
}
public string ToString() {
string s = "{";
int count = 0;
for (int i = this.length-1; i >= 0; i--) {
if (count > 0) {
s += ", ";
}
count++;
s += "" + this.values[i];
}
s += "}";
return s;
}
}
