How to correctly replace random numbers in a two-dimensional array with symbols-CodePudding

I have created a two-dimensional array with random filling of numbers not exceeding 1. I need to replace the numbers: "0" with the character "_", and "1" with the character "*". I can't do it at all. How do I do it right..?

Console.Write("Enter the width of the field: ");
int q = Convert.ToInt32(Console.ReadLine());

Console.Write("Enter the length of the field: ");
int w = Convert.ToInt32(Console.ReadLine());

int[,] myArray = new int[q, w];
Random rand = new Random();

for (int i = 0; i < q; i  )
{
    for (int j = 0; j < w; j  )
    {
        myArray[i, j] = rand.Next(2);

        if (i == 0)
        {
            Regex regex = new Regex(myArray[i, j]);
            regex.Replace("_", myArray[i, j]);
        }

        if (j == 1)
        {
            Regex regex = new Regex(myArray[i, j]);
            regex.Replace("*", myArray[i, j]);
        }

        Console.Write(myArray[i, j]);
    }
    Console.WriteLine();
}

CodePudding user response：

You can't replace int by char since c# is statically typed (unless you use dynamic).

If you want to fill with random _ and *, those are characters, then you want to use a character array:

var rand = new Random();
var charArray = new char[q, w];
for (int i = 0; i < q; i  )
for (int j = 0; j < w; j  )
    charArray[i, j] = rand.Next(2) == 0 ? '_':'*';

If you want both int and char arrays, you need to declare both, and you may fill them together or separately:

var charArray = new char[q, w];
var intArray = new int[q, w];
for (int i = 0; i < q; i  )
for (int j = 0; j < w; j  )
{
    intArray[i, j] = rand.Next(2);
    charArray[i, j] = intArray[i, j] == 0 ? '_':'*';
}

If you want to do a replace, you want to use char all the time:

var charArray = new char[q, w];
for (int i = 0; i < q; i  )
for (int j = 0; j < w; j  )
    charArray[i, j] = rand.Next(2) == 0 ? '0':'1';

for (int i = 0; i < q; i  )
for (int j = 0; j < w; j  )
    charArray[i, j] = charArray[i, j] == '0' ? '_':'*';

My piece of advice is to keep regex, which is slower, for actual complex replacements (with wildcard, logical or, grouping, quantification) within strings (with double quote "my string").

CodePudding user response：

Try this:

for (int i = 0; i < q; i  )
{
    for (int j = 0; j < w; j  )
    {
        int randomValue = rand.Next(2);

        myArray[i, j] = randomValue == 0 ? "_" : "*";

        Console.Write(myArray[i, j]);
    }

    Console.WriteLine();
}