C# code to check the first character in the string is an integer and then convert to hex if integer

Question

In the input script, check the first character of the input parameter. If it is a digit value, then convert the integer to hex.

For example input is 7fph7vfxbvkl then output becomes _x0037_fph7vfxbvkl .looking for a c# script for this

Thank you

Answer 1

This sounds like a homework assignment or perhaps exam question. Please post the code you have to implement this so far. Also please provide the context of what you're actually trying to do.

For homework then please refer to Char.IsDigit. For conversion then take a look at the custom format specifiers defined here.

Answer 2

@Sree, Welcome to Microsoft Q&A, you could try the following code to convert int to hex string successfully as you wanted.

First, we could use val.ToCharArray()[0] to get the first char of string.

Second, we could use Char.IsDigit(firstchar) to check if the char is number.

Third, we could use v.ToString("X4") to get the hex string.

 static void Main(string[] args)
        {
           
            var str = ConvertHex("7fph7vfxbvkl");
        }
        public static string ConvertHex(string val)
        {
            string retval = "";
            char firstchar = val.ToCharArray()[0];
            if (Char.IsDigit(firstchar))
            {
                int v = Convert.ToInt32(firstchar);
                retval = string.Format("_x{0}_{1}", v.ToString("X4"),val.Remove(0,1));

            }
            return retval;
        }

Result:

Hope my code could help you.

Best Regards,

Jack

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