How to fix it so that it displays 0-9?

If in C# numbers are displayed as something other than 0-9, there might be an error in the loop or in converting numbers to strings.

Example of correct output for numbers from 0 to 9:

for (int i = 0; i < 10; i++)
{
    Console.Write(i); // outputs digits consecutively: 0123456789
}

If you want to output with spaces or line breaks:

for (int i = 0; i < 10; i++)
{
    Console.Write(i + " "); // 0 1 2 3 4 5 6 7 8 9 
}

Make sure the loop starts at 0 and the condition is i < 10, not i <= 9 (which is also correct). Also, ensure that there is no incorrect conversion of numbers to characters, such as adding to the code of '0' in a char.

If the problem is that characters are displayed instead of digits, use Console.Write(i.ToString()) or simply Console.Write(i).