Question

I have an object declared as:

private string SourceProgram;

Basically i am trying to parse some stuff using the code below:

 private void LabelScan(System.IO.BinaryWriter OutputFile, bool IsLabelScan)
        {

            if (char.IsLetter(SourceProgram[CurrentNdx]))
            {
               if (IsLabelScan) LabelTable.Add(GetLabelName(), AsLength);
                while (SourceProgram[CurrentNdx] != '\n')
                    CurrentNdx++;
                CurrentNdx++;
                return;
            }
            EatWhiteSpaces();
            ReadMneumonic(OutputFile, IsLabelScan);
        }

However i get an error on execution:

-       SourceProgram[CurrentNdx]   
'SourceProgram[CurrentNdx]' threw an exception of 
type 'System.IndexOutOfRangeException'  char {System.IndexOutOfRangeException}

-       base    {"Index was outside the bounds of the array."}
    System.SystemException {System.IndexOutOfRangeException}

And the Value of CurrentNdx is 46.

What has gone wrong. Is the string variable SourceProgram of length < 46 ?

If yes, how to fix this code?

Answer 1

Yes, this error suggests that SourceProgram has less than 47 characters. That’s pretty much all we can tell you though without seeing the contents of SourceProgram.