array handling and vb .net to c# translation help

[whidbey]

I am new to C# and I would like to know how to handle array in C#. Here's the code I wrote in vb .net. I got stuck when I tried to translated it to C#. Could someone help?

    Sub Main()
        Randomize()
        Dim randNum(45) As Integer  ' counters
        Dim randGen As New Random(DateTime.Now.Millisecond)  ' random generator
        Dim randInd As Integer = 0  ' loop counter

        Dim intTemp As Int16 = 0

        'Start...
        For randInd = 1 To 2000
            randNum(randGen.Next(1, 46)) += 1  ' increment counter
        Next

        Console.WriteLine("Numbers   Times")
        Console.WriteLine("=======   =====")

        For randInd = 1 To 45
            Console.WriteLine(randInd.ToString().PadLeft(3) + "       " + randNum(randInd).ToString())
        Next

        'Most frequent randomized number:
        Dim temp As String
        'Dim memory As String
        Dim check As Int16
        Dim checkTime As Int16
        checkTime = 7

        Console.WriteLine("")
        Console.WriteLine("The top 7 most frequent randomized numbers are:")
        Console.WriteLine("")

        For check = 1 To checkTime
            For randInd = 1 To 45
                If randNum(randInd) = intTemp Then
                    If temp.Length <> 0 Then
                        temp = temp + " & " + randInd.ToString()
                        'memory = randInd.ToString()
                    Else
                        temp = randInd.ToString()
                        'memory = randInd.ToString()
                    End If
                ElseIf randNum(randInd) > intTemp And randNum(randInd) <> intTemp Then
                    intTemp = randNum(randInd)
                    temp = randInd.ToString()
                    'memory = randInd.ToString()
                End If
            Next

            For randInd = 1 To 45
                If randNum(randInd) = intTemp Then randNum(randInd) = 0
            Next

            Console.WriteLine(temp.PadLeft(25) + ": " + intTemp.ToString() + " times") 'Write the top numbers
            intTemp = 0
        Next check

        Console.WriteLine("")
        Console.WriteLine("Press any key to continue")
        Console.ReadLine()

    End Sub

[PT Exorcist]

whats where u have problems with? in c# the array indexer simbol is [] instead of vb's () so in a string array you do myArray[0] to get the first slot of the array

[whidbey]

here: Console.WriteLine(randInd.ToString().PadLeft(3) + " " + randNum(randInd).ToString())
when i used [] it told me error or something

[PT Exorcist]

Console.WriteLine(randInd.ToString().PadLeft(3) + " " + randNum[randInd].ToString());

[whidbey]

not doesn't work. it says cannot apply indexing with [] to an expression as type 'int'

it also happens when I try to do this...

for(randInd=1; randInd<=2000; randInd++)
{	randNum[randGen.Next(45)]++;	}

[DevGrp]

randNum is not declared as an array. Try this

int[] randNum = new int[45];

[whidbey]

thanks but this doesn't work still:

Console.WriteLine(randInd.ToString().PadLeft(3) + " " + randNum[randInd].ToString());

[DevGrp]

Post all the C# code that you have.

[whidbey]

i haven't finished it yet but so far this is what i got...

int[] randNum = new int[45];
			Random randGen = new Random();
			int randInd = 0;
			int intTemp = 0;

			//Start
			for(randInd=1; randInd<=2000; randInd++)
			{	randNum[randGen.Next(45)]++;	}

			Console.WriteLine("Numbers   Times");
			Console.WriteLine("=======   =====");			

			for(randInd=1; randInd<=45; randInd++)
			{
				Console.WriteLine(randInd.ToString().PadLeft(3) + " " + randNum[randInd].ToString());
            }

[DevGrp]

I just ran the code and it worked fine. I do get an exception at the end saying index is out of range. The reason for that is because arrays in C# are zero based. They start at zero. So if I sad

int[] num = new int[3]; 
//indexing would start at zero
num[0] = 100;
num[1] = 200;
num[2] = 300;

num[3] = 400 // this would throw an out of range exception

So I made a few changes to your code;

int[] randNum = new int[45];
Random randGen = new Random();
int randInd = 0;
int intTemp = 0;

//Start
for(randInd=1; randInd<=2000; randInd++)
{	
	randNum[randGen.Next(45)]++;	
}

Console.WriteLine("Numbers   Times");
Console.WriteLine("=======   =====");			

for(randInd=0; randInd < 45; randInd++)
{
	Console.WriteLine(randInd.ToString().PadLeft(3) + " " + randNum[randInd].ToString());
}
Console.ReadLine();

[PT Exorcist]

in vb.net arent they all 0 based too?

[ggprogram]

Originally posted by PT Exorcist
in vb.net arent they all 0 based too?

Both are zero based but the size differs.

Dim aData(4) As Object creates an array of five elements, zero through 4.

object[] aData = new object[4]; creates an array of 4 elements, zero through 3.

[whidbey]

I guess in VB, you can make them start from 1 to the desired number?!

[PT Exorcist]

yeah you can set the lower and upper bound..from 69 to 666 for example

[whidbey]

Here are my final codes. Anything to change/improve or are there any faster ways to accomplish the task?

using System;

namespace ConsoleApplication1
{
	/// <summary>
	/// Randomize from 0~44 for 200 times then pick up 7 of the most frequent randomized numbers.
	/// </summary>
	class Class1
	{
		/// <summary>
		/// See summary of Class1
		/// </summary>
		[STAThread]
		static void Main(string[] args)
		{
			int[] randNum = new int[45];
			Random randGen = new Random();
			int randInd = 0;
			int intTemp = 0;

			// Start
			for(randInd=1; randInd<=2000; randInd++)
			{	
				randNum[randGen.Next(45)]++;	
			}

			Console.WriteLine("Numbers   Times");
			Console.WriteLine("=======   =====");			

			for(randInd=0; randInd < 45; randInd++)
			{
				Console.WriteLine(randInd.ToString().PadLeft(3) + "       " + randNum[randInd].ToString());
			}

			// Most frequent randomized numbers:
			string temp="";
			int check;
			int checkTime = 7;
			
			Console.WriteLine("");
			Console.WriteLine("The top "+checkTime.ToString()+" most frequent randomized #'s are:");
			Console.WriteLine("");

			for(check=1; check<=checkTime; check++)
			{
				for(randInd=0; randInd<45; randInd++)
				{
					if(randNum[randInd]==intTemp)
					{
						if(temp.Length!=0)
						{	temp=temp+" & "+randInd.ToString();	}
						else
						{	temp=randInd.ToString();	}
					}
					if(randNum[randInd]>intTemp && randNum[randInd]!=intTemp)
					{
						intTemp=randNum[randInd];
						temp=randInd.ToString();
					}
				}

				for(randInd=0; randInd<45; randInd++)
				{
					if(randNum[randInd]==intTemp)
					{	randNum[randInd]=0;	}
				}

				Console.WriteLine(temp.PadLeft(21)+": "+intTemp.ToString()+" times");
				intTemp=0;
			}

			Console.WriteLine("");
			Console.WriteLine("Press any key to continue");
			Console.ReadLine();
		}
	}
}