How To Convert A Number To an ASCII Character?

Question

I want to create an application where user would input a number and the program will throw back a character to the user.

Edit: How about vice versa, changing a ascii character into number?

Answer 1

You can use one of these methods to convert number to an ASCII / Unicode / UTF-16 character:

You can use these methods convert the value of the specified 32-bit signed integer to its Unicode character:

char c = (char)65; char c = Convert.ToChar(65);  

Also, ASCII.GetString decodes a range of bytes from a byte array into a string:

string s = Encoding.ASCII.GetString(new byte[]{ 65 }); 

Keep in mind that, ASCIIEncoding does not provide error detection. Any byte greater than hexadecimal 0x7F is decoded as the Unicode question mark ("?").

Answer 2

Edit: By request, I added a check to make sure the value entered was within the ASCII range of 0 to 127. Whether you want to limit this is up to you. In C# (and I believe .NET in general), chars are represented using UTF-16, so any valid UTF-16 character value could be cast into it. However, it is possible a system does not know what every Unicode character should look like so it may show up incorrectly.

// Read a line of input string input = Console.ReadLine();  int value; // Try to parse the input into an Int32 if (Int32.TryParse(input, out value)) {     // Parse was successful     if (value >= 0 and value < 128) {         //value entered was within the valid ASCII range         //cast value to a char and print it         char c = (char)value;         Console.WriteLine(c);     } }