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| using System;using System.Diagnostics;using System.Linq;public static class Program
{
public static void PushStringCopyArray(ref string[] array, string pushvalue) {
string[] temp = new string[array.Length];
temp[0] = pushvalue;
Array.Copy(array, 0, temp, 1, array.Length - 1);
array = temp;
}
public static void PushStringArray(ref string[] array, string pushvalue) {
int newLength = array.Length;
string[] temp = new string[array.Length];
temp[0] = pushvalue; //push new value on top of array
for (int i = 0; i < array.Length - 1; i++)
temp[i + 1] = array[i];
array = temp;
}
/// <summary>
/// Pop value from top of string[] ref array
/// </summary>
public static string PopStringArray(ref string[] array) {
int newLength = array.Length;
//string[] temp = new string[array.Length]; //default value is ""
string[] temp = Enumerable.Repeat("#", array.Length).ToArray(); //set a default value
string popvalue = array[0]; ////push new value on top of array
for (int i = array.Length - 1; i >= 1; i--)
temp[i - 1] = array[i];
array = temp;
return popvalue;
}
public static void PrintArray(ref string[] array) {
for (int i = 0; i < array.Length; i++)
Console.Write("a[" + i + "]=" + array[i] + ",");
Console.WriteLine();
Console.WriteLine();
}
public static void Main() {
Stopwatch sw = new Stopwatch();
string[] test = new string[] {"z","a","b","c"};
Console.WriteLine("Pop/Push Array Test");
Console.WriteLine("Arr Len=" + test.Length);
PrintArray(ref test);
PushStringArray(ref test, "1st");
PrintArray(ref test);
PushStringArray(ref test, "2nd");
PrintArray(ref test);
PushStringArray(ref test, "3rd");
PrintArray(ref test);
sw.Start();
PushStringArray(ref test, "4th");
sw.Stop();
Console.WriteLine(sw.ElapsedTicks + " ticks. WOW! For loop, but still O(n).");
PrintArray(ref test);
sw.Start();
PushStringCopyArray(ref test, "5th");
sw.Stop();
Console.WriteLine(sw.ElapsedTicks + " ticks. Array.Copy: I thought this would be better.");
PrintArray(ref test);
Console.WriteLine(PopStringArray(ref test));
PrintArray(ref test);
Console.WriteLine(PopStringArray(ref test));
PrintArray(ref test);
Console.WriteLine(PopStringArray(ref test));
PrintArray(ref test);
Console.WriteLine(PopStringArray(ref test));
PrintArray(ref test);
Console.WriteLine(PopStringArray(ref test));
PrintArray(ref test);
}
}
|
