Comma Formatting for numbers in C++

Question

I\'m needing help in adding commas to the number the user enters, some guidance or help would be appreciated. So far I have it where i store the first three digits and the l

Answer 1

// Accepts a long number, returns a comma formatted string
CString num_with_commas(long lnumber)
{
    CString num;
    num.Format(%d",lnumber);
    if(num.GetLength() > 3) {num.Insert(num.GetLength()-3, ',');}
    if(num.GetLength() > 7) { num.Insert(num.GetLength()-7, ','); }
    if (num.GetLength() > 12) { num.Insert(num.GetLength()-12, ','); }
    return(num);
}