how to to multiply and divide in a static stack? - c#

This is the static array I have been given in making a RPN calculator. From this code the RPN calculator adds and subtracts. Now I need to extend my code to multiply and divide but I cant I don't know how.
public class IntStack
{
private const int maxsize = 10;
private int top = 0;
private int[] array = new int[maxsize];
public void Push(int value)
{
array[top++] = value;
}
public int Pop()
{
return array[--top];
}
public int Peek()
{
return array[top - 1];
}
public bool IsEmpty()
{
return top == 0;
}
public bool IsFull()
{
return top == maxsize;
}
public string Print()
{
StringBuilder output = new StringBuilder();
for (int i = top - 1; i >= 0; i--)
output.Append(array[i] + Environment.NewLine);
return output.ToString();
}
}

Here are some methods you can add to your IntStack class that will perform the multiply and division operations. I've added minimal error checking.
public void Multiply()
{
if (array.Length < 2)
return;
var factor1 = Pop();
var factor2 = Pop();
Push(factor1 * factor2);
}
public void Divide()
{
if (array.Length < 2)
return;
var numerator = Pop();
var divisor = Pop();
if (divisor == 0) { // Return stack back to original state.
Push(divisor);
Push(numerator);
return;
}
Push(numerator / divisor);
}

Related

Add another item in array without built-in functions

The following script is working fine. But need to add one more item in array without built-in function. Is it possible to do without Resize() ?
string[] data = {"item-1", "item-2"};
Array.Resize(ref data, 3);
data[2] = "item-3";
foreach(string i in data) {
Console.WriteLine(i);
}
No. Arrays are fixed size, so the only way to add more stuff to them is to resize them.
If you have a scenario where you need to add a dynamic number of elements, use List<T> instead.
Assuming you're trying to increase the size of an array without any built-in libraries or data structures, you just need to create a new larger array, copy the old elements, then add your new element.
string[] data = {"item-1", "item-2"};
string[] newData = new string[data.Length + 1];
int i;
for (i = 0; i < data.Length; i++) {
newData[i] = data[i];
}
newData[i] = "item-3";
Console.WriteLine(newData[2]);
The short answer is no. But if you want you can always implement a logic that does the resizing. You could do something like this implementation of a List:
public class List<T> : IAbstractList<T>
{
private const int DEFAULT_CAPACITY = 4;
private T[] _items;
public List()
: this(DEFAULT_CAPACITY) {
}
public List(int capacity)
{
if (capacity < 0)
{
throw new ArgumentOutOfRangeException(nameof(capacity));
}
this._items = new T[capacity];
}
public T this[int index]
{
get
{
this.ValidateIndex(index);
return this._items[index];
}
set
{
this.ValidateIndex(index);
this._items[index] = value;
}
}
public int Count { get; private set; }
public void Add(T item)
{
this.GrowIfNecessary();
this._items[this.Count++] = item;
}
public bool Contains(T item)
{
for (int i = 0; i < this.Count; i++)
{
if (this._items[i].Equals(item))
{
return true;
}
}
return false;
}
public int IndexOf(T item)
{
for (int i = 0; i < this.Count; i++)
{
if (this._items[i].Equals(item))
{
return i;
}
}
return -1;
}
public void Insert(int index, T item)
{
this.ValidateIndex(index);
this.GrowIfNecessary();
for (int i = this.Count - 1; i > index; i--)
{
this._items[i] = this._items[i - 1];
}
this._items[index] = item;
this.Count++;
}
public bool Remove(T item)
{
var index = this.IndexOf(item);
if (index == - 1)
{
return false;
}
this.RemoveAt(index);
return true;
}
public void RemoveAt(int index)
{
this.ValidateIndex(index);
for(int i = index; i < this.Count - 1; i++)
{
this._items[i] = this._items[i + 1];
}
this._items[this.Count - 1] = default;
this.Count--;
}
public IEnumerator<T> GetEnumerator()
{
for (int i = 0; i < this.Count; i++)
{
yield return this._items[i];
}
}
IEnumerator IEnumerable.GetEnumerator()
=> this.GetEnumerator();
private void ValidateIndex(int index)
{
if (index < 0 || index >= this.Count)
{
throw new IndexOutOfRangeException(nameof(index));
}
}
private void GrowIfNecessary()
{
if (this.Count == this._items.Length)
{
var array = new T[this.Count * 2];
Array.Copy(this._items, array, this._items.Length);
this._items = array;
}
}
}
The above sample code can give you ideas about implementing other methods that need array resizing as well.

Addresses of values in an array aren't static C#

So, I am currently making a little code with some pointers. I am trying to get every values of an array, and their respective address. However, the initial array is empty, and the user has to enter numbers as an input, which ends up being added to the array itself. Then, I want to get the address of each value that the user added, one by one. Everything works fine, except one thing; I want every value to have a static address. However, I noticed that at every inputs, every values had a different address than the one they had before. I tried to put the array as a global static variable, but it still doesn't work. Any help?
Thanks for everyone who takes their time to answer! <3
Full code:
using System;
public class ClearIt
{
public int k = 8;
}
public static class Arr
{
public static int StaticAddress;
public static int[] x = { };
}
public class Class
{
public static unsafe void Main()
{
ClearIt clearIt = new ClearIt();
int k2 = clearIt.k;
for (int j = 0; j < 1;)
{
string Read = Console.ReadLine();
int ReadToInt;
bool isTrue;
isTrue = int.TryParse(Read, out ReadToInt);
if (!isTrue)
{
return;
}
int StaticAdd = Arr.StaticAddress = ReadToInt;
if (k2 > 0)
{
var xList = Arr.x.ToList();
xList.Add(StaticAdd);
Arr.x = xList.ToArray();
Array.Sort(Arr.x);
k2--;
}
else if(k2 == 0)
{
Console.ForegroundColor = ConsoleColor.Red;
var xList2 = Arr.x.ToList();
xList2.Clear();
Arr.x = xList2.ToArray();
Console.WriteLine("Array cleared.");
Console.ForegroundColor = ConsoleColor.White;
k2 = 8;
}
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine("\nValues\tAddresses");
for (int i = 0; i < Arr.x.Length; i++)
{
fixed (int* y = &Arr.x[i])
{
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine("\n" + *y + $"\t{(long)y:X}\n");
Console.ForegroundColor = ConsoleColor.White;
}
}
}
}
}
The short answer is that everytime you assign to Arr.x you are creating a new array and a new part of memory is used.
The statement below for example causes Arr.x address to change
Arr.x = xList2.ToArray();
If you do not want to change the address of Arr.x, then only assign it once to the maximum length, and keep track of the item count actually stored.
My best guess is that you are trying to do something like this
where the addresses in memory do not change when items are added or the
array is cleared. After the 8th number is added, the list clears
and more numbers can be added
As you can see the address value does not change.
I am using fixed buffer arrays to store the values, instead of the regular array. Here is the code that generates the output above
class Program
{
static void Main(string[] args)
{
var arr = new FixedArray();
do
{
Console.Clear();
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine($"{"offset"}\t{"address"}\t{"value"}");
for (int i = 0; i < arr.Count; i++)
{
Console.ForegroundColor = ConsoleColor.Gray;
Console.Write($"{i}");
Console.ForegroundColor = ConsoleColor.Yellow;
Console.Write($"\t{arr.GetItemAddress(i)}");
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine($"\t{arr[i]:X}");
Console.ForegroundColor = ConsoleColor.Gray;
}
if (arr.Count == 0)
{
Console.ForegroundColor = ConsoleColor.Red;
Console.WriteLine("Array Cleared.");
Console.ForegroundColor = ConsoleColor.Gray;
Console.WriteLine();
}
Console.WriteLine("Enter Value:");
string input = Console.ReadLine();
if (int.TryParse(input, out int value))
{
if (arr.Add(value))
{
}
else
{
arr.Clear();
}
}
else
{
return;
}
} while (true);
}
}
and FixedArray is the object that actually stores the data
public unsafe struct FixedArray
{
public const int Size = 8;
fixed int data[Size];
public FixedArray(params int[] array) : this()
{
Count = Math.Min(Size, array.Length);
fixed (int* ptr = data)
{
for (int i = 0; i < Count; i++)
{
ptr[i] = array[i];
}
}
}
public IntPtr GetItemAddress(int offset = 0)
{
fixed (int* ptr = &data[offset])
{
return (IntPtr)ptr;
}
}
public int this[int offset]
{
get
{
if (offset >= 0 && offset < Count)
{
return data[offset];
}
return 0;
}
}
public int Count { get; private set; }
public void Clear() { Count = 0; }
public bool Add(int x)
{
if (Count < Size)
{
data[Count] = x;
Count++;
return true;
}
return false;
}
public int[] ToArray()
{
int[] array = new int[Count];
fixed (int* ptr = data)
{
for (int i = 0; i < Count; i++)
{
array[i] = ptr[i];
}
}
return array;
}
}
You don't have to use a fixed buffer array. You can just use a standard array, but with the readonly keyword so it only gets assigned once. Use the class below as a replacement to FixedArray above.
public class StdArray
{
public const int Size = 8;
public int Count { get; private set; }
readonly int[] data;
public StdArray(params int[] array)
{
data = new int[Size];
Count = Math.Min(Size, array.Length);
Array.Copy(array, data, Count);
}
public unsafe IntPtr GetItemAddress(int offset = 0)
{
fixed (int* ptr = &data[offset])
{
return (IntPtr)ptr;
}
}
public int this[int offset]
{
get
{
if (offset >= 0 && offset < Count)
{
return data[offset];
}
return 0;
}
}
public void Clear() { Count = 0; }
public bool Add(int x)
{
if (Count < Size)
{
data[Count] = x;
Count++;
return true;
}
return false;
}
public int[] ToArray()
{
int[] array = new int[Count];
Array.Copy(data, array, Count);
return array;
}
}

C# Binary Tree, Max and Min Value

I wrote some code and have some problems, but the most important question is: why is the array not working with AddNode? I know I am close to solving this problem, but I hope for a little hint.
Next question: the code for Min and Max value is good. How can I move it to Class Node?
And the last question: how to make Class Depth for tree?
class Node
{
public Node LeftNode { get; set; }
public Node MiddleNode { get; set; }
public Node RightNode { get; set; }
public int Value { get; set; }
public void AddNode(int value)
{
if (value < this.Value)
{
if (LeftNode != null)
{
LeftNode.AddNode(value);
return;
}
LeftNode = new Node(value);
return;
}
if (value > Value)
{
if (RightNode != null)
{
RightNode.AddNode(value);
return;
}
RightNode = new Node(value);
return;
}
if (MiddleNode != null)
{
MiddleNode.AddNode(value);
return;
}
MiddleNode = new Node(value);
}
public Node(int value)
{
this.Value = value;
}
public override string ToString()
{
return $"Value: {Value}";
}
public string SortedString(Array arr)
{
Array.Sort(arr);
foreach (int val in arr)
{
Console.WriteLine(val);
}
return "";
}
public int ValueCount(int value)
{
if (value < Value)
{
if (LeftNode == null)
{
return -1;
}
return LeftNode.ValueCount(value);
}
if (value > Value)
{
if (RightNode == null)
{
return -1;
}
return RightNode.ValueCount(value);
}
if (MiddleNode != null)
{
return 1 + MiddleNode.ValueCount(value);
}
return 1;
}
internal int Next(int min, int max)
{
Random rnd = new Random();
return rnd.Next(min, max);
}
}
class Program
{
static void Main(string[] args)
{
var arr = new int[1000];
var rnd = new Node(1);
for (int i = 0; i < arr.Length; i++)
{
rnd.AddNode(arr[i]);
//Console.WriteLine(arr[i]);
}
for(int i = 0; i < arr.Length; i++)
{
arr[i] = rnd.Next(1, 100);
Console.WriteLine(arr[i]);
}
min = arr[0];
max = arr[0];
for (int i = 1; i < arr.Length; i++)
{
if (min > arr[i])
min = arr[i];
if (max < arr[i])
max = arr[i];
}
Console.WriteLine("największa liczba" + " " + max);
Console.WriteLine("najmniejsza liczba" + " " + min);
Array.Sort(arr);
foreach (int value in arr)
{
Console.WriteLine(value);
}
Console.WriteLine(rnd.ValueCount(6));
Console.WriteLine(rnd.ToString());
}
}
To be honest - your code is a bit confusing.
first of all - why do you have a pointer (ref) to a middle node ? A binary tree defines each node to have at most 2 children (left \ right).
If you wish to handle duplicate values you can either choose a strategy that defines one of the children to also includes equals, or better use ref count (e.g.: each node has both a value and a counter for this value).
re Min \ Max - if your tree is a BST (which it seems to be the case), you can easily implement this through simple tree traversing either to the left (for Min value) or to the right (for max value).

A* pathfinding algorithm - got stuck calculating shortest path

I'm trying to implement A* algorithm in order to find the shortest path in given grid.
My Node class:
public class Node : IComparable
{
public Node(int row, int col, Node previousNode = null, double distance = double.PositiveInfinity)
{
this.Row = row;
this.Col = col;
this.PreviousNode = previousNode;
this.Distance = distance;
}
public int Row { get; }
public int Col { get; }
public bool IsVisited { get; internal set; }
public double Distance { get; set; }
public int Weight { get; set; } = 1;
public double GScore { get; set; } = double.PositiveInfinity;
public double H { get; set; }
public double FScore => this.GScore + this.H;
public NodeType? NodeType { get; internal set; }
public Node PreviousNode { get; set; }
public override bool Equals(object obj)
{
var otherNode = obj as Node;
return this.Equals(otherNode);
}
protected bool Equals(Node other)
=> this.Row == other.Row && this.Col == other.Col;
public override int GetHashCode()
{
unchecked
{
return (this.Row * 397) ^ this.Col;
}
}
public int CompareTo(object obj)
{
var otherNode = obj as Node;
if (this.FScore == otherNode.FScore)
{
if (this.H >= otherNode.H)
{
return 1;
}
else if (this.H < otherNode.H)
{
return -1;
}
}
return this.FScore.CompareTo(otherNode.FScore);
}
}
A* algo class:
public override Result Execute(Node[,] grid, Node startNode, Node endNode)
{
var heap = new MinHeap<Node>();
var allSteps = new HashSet<Node>();
startNode.GScore = 0;
startNode.H = ManhattanDistance(startNode, endNode);
startNode.IsVisited = true;
heap.Add(startNode);
while (heap.Count != 0)
{
var currentNode = heap.Pop();
if (currentNode.NodeType == NodeType.Wall)
continue;
allSteps.Add(currentNode);
if (currentNode.Equals(endNode))
{
return new Result(allSteps, this.GetAllNodesInShortestPathOrder(currentNode));
}
var rowDirection = new[] { -1, +1, 0, 0 };
var columnDirection = new[] { 0, 0, +1, -1 };
for (int i = 0; i < 4; i++)
{
var currentRowDirection = currentNode.Row + rowDirection[i];
var currentColDirection = currentNode.Col + columnDirection[i];
if ((currentRowDirection < 0 || currentColDirection < 0)
|| (currentRowDirection >= grid.GetLength(0)
|| currentColDirection >= grid.GetLength(1)))
{
continue;
}
var nextNode = grid[currentRowDirection, currentColDirection];
AddNodeToHeap(currentNode, nextNode, endNode, heap);
}
}
return new Result(allSteps);
}
private void AddNodeToHeap(Node currentNode, Node nextNode, Node endNode, MinHeap<Node> heap)
{
if (nextNode.IsVisited || nextNode.GScore < currentNode.GScore)
return;
var g = currentNode.GScore + nextNode.Weight;
var h = ManhattanDistance(nextNode, endNode);
if (g + h < nextNode.FScore)
{
nextNode.GScore = g;
nextNode.H = h;
nextNode.PreviousNode = currentNode;
nextNode.IsVisited = true;
}
heap.Add(nextNode);
}
private static int ManhattanDistance(Node currentNode, Node endNode)
{
var dx = Math.Abs(currentNode.Row - endNode.Row);
var dy = Math.Abs(currentNode.Col - endNode.Col);
return dx + dy;
}
Custom MinHeap class:
public class MinHeap<T>
{
private readonly IComparer<T> comparer;
private readonly List<T> list = new List<T> { default };
public MinHeap()
: this(default(IComparer<T>))
{
}
public MinHeap(IComparer<T> comparer)
{
this.comparer = comparer ?? Comparer<T>.Default;
}
public MinHeap(Comparison<T> comparison)
: this(Comparer<T>.Create(comparison))
{
}
public int Count => this.list.Count - 1;
public void Add(T element)
{
this.list.Add(element);
this.ShiftUp(this.list.Count - 1);
}
public T Pop()
{
T result = this.list[1];
this.list[1] = this.list[^1];
this.list.RemoveAt(this.list.Count - 1);
this.ShiftDown(1);
return result;
}
private static int Parent(int i) => i / 2;
private static int Left(int i) => i * 2;
private static int Right(int i) => i * 2 + 1;
private void ShiftUp(int i)
{
while (i > 1)
{
int parent = Parent(i);
if (this.comparer.Compare(this.list[i], this.list[parent]) > 0)
{
return;
}
(this.list[parent], this.list[i]) = (this.list[i], this.list[parent]);
i = parent;
}
}
private void ShiftDown(int i)
{
for (int left = Left(i); left < this.list.Count; left = Left(i))
{
int smallest = this.comparer.Compare(this.list[left], this.list[i]) <= 0 ? left : i;
int right = Right(i);
if (right < this.list.Count && this.comparer.Compare(this.list[right], this.list[smallest]) <= 0)
{
smallest = right;
}
if (smallest == i)
{
return;
}
(this.list[i], this.list[smallest]) = (this.list[smallest], this.list[i]);
i = smallest;
}
}
}
The problem is that it doesn't find the optimal path when I have some weights on the map. For example:
Every square on the grid which is marked as a weight node has weight of 10 otherwise it's 1.
Here's example:
Example grid with 3 weight nodes - green node is start node, red node is end node and the dumbbell node is weight node.
When I run the algorithm I get the following result.
It's clearly visible that this is not the shortest path since the algorithm goes through the first node which has weight 1 and then the next node with weight 10 instead of just passing one 10 weight node. The shortest path should've been the red one which I've marked.
P.S I've managed to make it respect the weights by adding new heuristic function when calculating GCost and it now calculates the path but instead of one straight line I get some strange path:
Thank you in advance!
#jdweng
I actually fixed the bug by implementing an additional method which adds additional weight to the GScore
blue squares - all steps which the algorithm took in order to find the shortest final path
A* Algo with weights
A* algo without weights
[
Dijkstra Algo with weights
Dijkstra Algo without weights
private (double weight, NodeDirection? Direction) GetDistanceAndDirection(Node nodeOne, Node nodeTwo)
{
var x1 = nodeOne.Row;
var y1 = nodeOne.Col;
var x2 = nodeTwo.Row;
var y2 = nodeTwo.Col;
if (x2 < x1 && y1 == y2)
{
switch (nodeOne.Direction)
{
case NodeDirection.Up:
return (1, NodeDirection.Up);
case NodeDirection.Right:
return (2, NodeDirection.Up);
case NodeDirection.Left:
return (2, NodeDirection.Up);
case NodeDirection.Down:
return (3, NodeDirection.Up);
}
}
else if (x2 > x1 && y1 == y2)
{
switch (nodeOne.Direction)
{
case NodeDirection.Up:
return (3, NodeDirection.Down);
case NodeDirection.Right:
return (2, NodeDirection.Down);
case NodeDirection.Left:
return (2, NodeDirection.Down);
case NodeDirection.Down:
return (1, NodeDirection.Down);
}
}
if (y2 < y1 && x1 == x2)
{
switch (nodeOne.Direction)
{
case NodeDirection.Up:
return (2, NodeDirection.Left);
case NodeDirection.Right:
return (3, NodeDirection.Left);
case NodeDirection.Left:
return (1, NodeDirection.Left);
case NodeDirection.Down:
return (2, NodeDirection.Left);
}
}
else if (y2 > y1 && x1 == x2)
{
switch (nodeOne.Direction)
{
case NodeDirection.Up:
return (2, NodeDirection.Right);
case NodeDirection.Right:
return (1, NodeDirection.Right);
case NodeDirection.Left:
return (3, NodeDirection.Right);
case NodeDirection.Down:
return (2, NodeDirection.Right);
}
}
return default;
}
and then AddNodeToHeapMethod()
private void AddNodeToHeap(Node currentNode, Node nextNode, Node endNode, MinHeap<Node> heap)
{
if (nextNode.IsVisited)
return;
var (additionalWeight, direction) = this.GetDistanceAndDirection(currentNode, nextNode);
var g = currentNode.GScore+ nextNode.Weight + additionalWeight;
var h = this.ManhattanDistance(nextNode, endNode);
if (g < nextNode.GScore)
{
nextNode.GScore= g;
nextNode.H = h;
nextNode.PreviousNode = currentNode;
nextNode.IsVisited = true;
}
currentNode.Direction = direction;
heap.Add(nextNode);
}

Finding minimum value from list

How would i build an algorithm here in the most efficient way possible to find minimum value from list? I know the list hasnt done in the best way but, any ideas how to do ?
I have tried few ways but dont seem to get it work efficiently..
Thanks.
class MainClass
{
public class List
{
public int maxSize = 50;
public int MaxSize
{
get
{
return maxSize;
}
set
{
maxSize = value;
}
}
public int firstEmpty = 0;
public int FirstEmpty
{
get
{
return firstEmpty;
}
set
{
firstEmpty = value;
}
}
public int[] data;
public List()
{
data = new int[maxSize];
}
public int returnValueAtIndex(int i)
{
return data[i];
}
public void setValueAtIndex(int v, int i)
{
data[i] = v;
}
}
public static int FIRST(List L)
{
if (END(L) > 0)
return 0;
else
return -1;
}
public static int END(List L)
{
return L.FirstEmpty;
}
public static int NEXT(int p, List L)
{
if (p >= 0 && p < L.MaxSize && p < END(L))
return p+1;
else
return - 1;
}
public static int PREVIOUS(int p, List L)
{
if (p >= 0 && p < L.MaxSize && p <= END(L))
return p-1;
else
return -1;
}
public static int LOCATE (int x, List L)
{
int i = 0;
while (i<END(L) && RETRIEVE(i, L) != x)
{
i++;
}
if (i != END(L))
return i;
else
return -1;
}
public static int RETRIEVE(int p, List L)
{
if (p >= 0 && p < END(L))
return L.returnValueAtIndex(p);
else
return -1;
}
public static void INSERT(int x, int p, List L)
{
if (p >= 0 && p < L.MaxSize && p <= END(L))
{
if (p == END(L))
{
L.setValueAtIndex(x, p);
}
else
{
for (int i = END(L); i > p; i--)
{
L.setValueAtIndex(L.returnValueAtIndex(i - 1), i);
L.setValueAtIndex(x, p);
}
}
L.FirstEmpty = END(L) + 1;
}
else
Console.WriteLine("Alkiota ei voitu lisätä");
}
public void DELETE(int p, List L)
{
if (p >= 0 && p < END(L))
{
for (int i = p; i < p - 1; i++)
{
L.setValueAtIndex(L.returnValueAtIndex(i + 1), i);
}
L.FirstEmpty = END(L) - 1;
}
}
public void MAKENULL(List L)
{
L.FirstEmpty = 0;
}
public static void PRINT(List L)
{
Console.WriteLine("Listan sisältö:");
for (int i = 0; i < END(L); i++)
{
Console.Write(L.returnValueAtIndex(i) + " ");
}
Console.WriteLine();
}
public static void Main(string[] args)
{
List testilista = new List();
INSERT(2, END(testilista), testilista);
INSERT(7, END(testilista), testilista);
INSERT(9, END(testilista), testilista);
INSERT(12, END(testilista), testilista);
INSERT(9, END(testilista), testilista);
INSERT(38, END(testilista), testilista);
Console.WriteLine("testilista");
PRINT(testilista);
Console.ReadLine();
}
}
}
The easiest way to do that in C# is with LinQ:
var minValue = data.Min();
if you want the highest value:
var maxValue = data.Max();
Note: Answer is not specific to C#
Given an unordered list of numbers, the fastest way to find the smallest number in the list is to look at every element in the list.
var unorderedList = [5,4,3,2,6,7,-23,8,-64,2,0,6];
function findSmallest(anArray){
var lowest = anArray[0];
for(var i = 1; i < anArray.length; i++){
var num = anArray[i];
if(num < lowest){
lowest = num;
}
}
return lowest;
}
var smallest = findSmallest(unorderedList);
console.log(smallest); //prints -64
You can run the code here
hit the run button
I don't think this is the best option. For me there is two ways.
Sort your list by this code.
int valueMin = L.returnValueAtIndex(0);
for (int i = 0; i < END(L); i++)
{
//if the value of i is smaller than the value
if (valueMin < L.returnValueAtIndex(i))
{
//i become the min Value
valueMin = L.returnValueAtIndex(i);
}
}
Console.WriteLine(valueMin);
Console.Read();
Or in C# you can use Array.Sort
Array.Sort(L);
Console.WriteLine(L.returnValueAtIndex(0));
Console.Read();
I hope this will help you !

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