Equivalent to choosing the Number tab in the Format Cells dialog box
[C++]
static int FormatNumber(
   const char* format_text
);
Format_text is a format string, such as "#, ##0.00", specifying which format to apply to the selection.
Zero if the function has been called successfully; non-zero
            if the function could not be called.
            See Error codes for a list
            of return values.
See the Microsoft Excel on-line Help for full details about
            this function.
Header: xlfuncs.h