Two-dimensional array as buffer for screen

Proposed exercise

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Create a C# program that declares a 70x20 two-dimensional array of characters, "draws" 80 letters (X, for example) in random positions and displays the content of the array on screen.

Output

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Solution

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using System;
public class Array2D
{   
public static void Main()
{
char[,] position = new char[ 20,70 ];

Random generator = new Random();
int i = 0;

for(; i < 80; i++)
position[generator.Next(0,20), generator.Next(0,70)] = 'X';

for(i = 0; i < 20; i++)
{
for(int j = 0; j < 70; j++)
Console.Write(position[ i,j ]);

Console.WriteLine();
}
}
}