How do I remove the character "" from the beginning of a text file in C++?

That's UTF-8's BOM

You need to read the file as UTF-8. If you don't need Unicode and just use the first 127 ASCII code points then save the file as ASCII or UTF-8 without BOM

This is Byte Order Mark (BOM). It's the representation for the UTF-8 BOM in ISO-8859-1. You have to tell your editor to not use BOMs or use a different editor to strip them out.

In C++, you can use the following function to convert a UTF-8 BOM file to ANSI.

void change_encoding_from_UTF8BOM_to_ANSI(const char* filename)
{
    ifstream infile;
    string strLine="";
    string strResult="";
    infile.open(filename);
    if (infile)
    {
        // the first 3 bytes (ef bb bf) is UTF-8 header flags
        // all the others are single byte ASCII code.
        // should delete these 3 when output
        getline(infile, strLine);
        strResult += strLine.substr(3)+"\n";

        while(!infile.eof())
        {
            getline(infile, strLine);
            strResult += strLine+"\n";
        }
    }
    infile.close();

    char* changeTemp=new char[strResult.length()];
    strcpy(changeTemp, strResult.c_str());
    char* changeResult = change_encoding_from_UTF8_to_ANSI(changeTemp);
    strResult=changeResult;

    ofstream outfile;
    outfile.open(filename);
    outfile.write(strResult.c_str(),strResult.length());
    outfile.flush();
    outfile.close();
}